I have a 18 inch tank. What size/length should I get? I see there is a 16-inch and 20-inch available...how much adjustment does the light allow for?
1998643
20 inch will be too long. The 16 inch has feet that can stretch. Depending on the Finnex model, there is an 18 inch available.
1998644
You don't want the 20, I have a 20 inch tank and the 20 inch light fits exactly edge to edge.
1998645
The 16" light legs may extend far enough, since you only need an inch on either side. The 20inch would or course overhang your tank but the legs could push farther in and fit on the 18". The 20" would give more light output too, I can tell you on my 10g (20"long) tank it provides more medium than low light.
1998646
I would go for a 16 inch because the side stands will give you the extra 2 inches you need.
1998647
You will be able to adjust the 20 inch to fit. Not sure about the 16. I own the 20
1998648
Here's what I know. We have a 27g cube that takes an 18" lid and the 20" works perfectly (it sits in place over the outer edge with the inner brackets removed). The brackets on this light do adjust some and the inner portion can be removed. We didn't feel the light needed to be bolted in place so ours is setting there in place.
1132757
The 16 inch fixture would be the best fit. Just a heads up that with such a small volume, and being only 10 inches deep, that is very high light for that aquarium. Adding Co2, and ferts will raise the maintenance needed, along with the headache and pain of dosing a pico tank with CO2.
2043610
The unit is exactly 24" in length with extenders on both sides that will extend the total out 26". I have a 48" wide 60 gal tank with a bar at the top in the center so I use 2 of the 24" units. I tried a 48" unit first but the center bar wouldn't allow the unit to sit securely. The units come with a single led bulb, but will house 3. You will want at least 2 bulbs per unit. In spite of the expense, I now have 3 bulbs per unit. Beware of knocking them into the tank! I managed to ruin one of the units by doing so! Best of luck!
1302523
My tank is 50g. It's ok for me. Your tank is almost double in size. In my opinion for medium high lighting, this light may not be sufficient.
1614904
You want full coverage of your tank. The minimum sizes of the fixtures are the actual length of the light bar, and then there are legs that pull out to extend to fit onto larger tanks. If you tank is 24" wide, you definitely want the 24" fixture, else you'll have a light that only lights up the middle, with 3" of unlit area to each side.
1178617
Hi. I am not sure. I think it would depend on the depth of your tank, from,what I have read.My tank is 24 inches tall, and it works well, but I am also using Flourish Excel for my plants, at the recommendation of my local pet store .I like the the light, it switches from led white to blue automatically, and is easily overridden as other people have noted.So, I can't tell you if it is ok for your tank, it would depend on your plants, but mostly the depth of your tank, due to physics that I can barely recall. There are are online sites you can access for help with the math.I think it mostly depends on the depth of your tank.I do like this light, but, can't give you specific advice. Have fun!!!! If you look Hi. I am not sure. I think it would depend on the depth of your tank, from,what I have read.My tank is 24 inches tall, and it works well, but I am also using Flourish Excel for my plants, at the recommendation of my local pet store .I like the the light, it switches from led white to blue automatically, and is easily overridden as other people have noted.So, I can't tell you if it is ok for your tank, it would depend on your plants, but mostly the depth of your tank, due to physics that I can barely recall. There are are online sites you can access for help with the... » Read More Hi. I am not sure. I think it would depend on the depth of your tank, from,what I have read.My tank is 24 inches tall, and it works well, but I am also using Flourish Excel for my plants, at the recommendation of my local pet store .I like the the light, it switches from led white to blue automatically, and is easily overridden as other people have noted.So, I can't tell you if it is ok for your tank, it would depend on your plants, but mostly the depth of your tank, due to physics that I can barely recall. There are are online sites you can access for help with the math.I think it mostly depends on the depth of your tank.I do like this light, but, can't give you specific advice. Have fun!!!! If you look « Show Less
1516144
Yea for sure I'm using one light fixture on my 90 gallon tall tank which has a similar footprint with a 40 gallon breeder. 36 inch long 18 inch wide and 32 inches tall. The light is plenty strong make sure you hang it a east 12 inches from top of the water to get good light dispersal for a three foot tank. Also takes some careful aqua scaping so you don't get any shadows on the side. Mine looks like a volcano very high in the middle and slopes down on both sides so as not creating casting almost any shadows. I run it at almost 80-90 percent and eveif I ran two I would probably not have aqua scales this way but I like the look and my coral in the bottom sandbed are getting enough light. I get ton of coralline algae on the sides of the tank so I am pretty confident the light is spreading enough. I don't have a gazillion corals so I did not see the need for more than one light and having one now I can definitely see that I can surely add more in the future without any problems. I am even having luck with sps corals so this is the real deal! You will definitely not be able to run them up that high intensity since the breeder is so much more of a shallow tank but that's good because you will be saving on electricity, also another reason I ran one light... Make sure you a climate your corals from very little light these lights are super powerful!
245002
Yes. I have mine about 2 inches above the tank, with a 24 inch high tank. I get about 35 PAR light intensity. With it on a 18 inch high tank you should get about 50-60 PAR, which is medium to high light, if not high light. If you have aquatic plants in the aquarium you will need to use pressurized CO2 or you will most likely have problems with algae.
1122401
honestly the light is great but not for a planted tank. If you decide to go with this, you will probably need 2. one on each side of the middle brace. I dont know what the dimensions are on each side so just measure that out and go with the closest size available to cover each side from left to right. (I think two 36") My recommendations for a planted tank would be to go with the Finnex FugeRay Planted+ http://www.amazon.com/gp/product/B00GH9HSC6/ref=oh_details_o07_s00_i00?ie=UTF8&psc=1 I have a 37 planted tank and it works great. It is a deep tank and everything both short and tall grows fantastically. Again, with this I would go with two separate lights to cover your tank.
1723885
It is great light for my 75g, the only thing you should look at is it's length, i have a 75 long, and i must extend the arms out to its longest setting to allow it to sit on top, and then the lights are shorter than the tanks length by a little. hope this helps.
250549
I am not sure how much light you need. I am using mine in a 4'x2'x2' for my panther chameleon but I am only about 12inches away. I think even though your tank is smaller since you have a bigger distance you would be okay. I love this light and do recommend it.
1878684
Hi there. My light,- the actual light bar itself, measures 22inches. It also has two metal prong/bars that extend from either side that fit over the top of the aquarium, that measure , in total, 36 inches. The extensions keep the light raised slightly off the top of the aquarium,probably for heat circulation. I didn't like the way the light hit my eyes, so I didn't use them. LEDs are pretty warm, and the top of my acrylic tank is now warped a it . Not a big deal for me. So, I think the 24to36 would be a good size, unless you want the light bar in direct contact with your aquarium top. The light is very bright, does that cool wave thing, and has supported my live plants well. The automatic on, off, of the white and blue lights is a perk I did not think I needed. But, it's great as a convenience, and easy to program. Hope this helps, if a bit wordy
1182603
This is a tank light, not a tank. The tank light fits a tank that measures 8"X16".
1440605
you can use the 12" if you want the light to go front to back, but ideally, we need the length of the tank since most lights run parallel to the front glass.
927755
Im running it on 75Gal (21" deep) I get low light at the substrate at best. I've said before to get medium light I would need 4 of these on my tank.
1878819
I'd get the 16in light. The feet that rest on the rim extend to the edge of the fixture and you'll want even coverage of the entire tank.
2180703
I have the light that is maybe 18" long mounted at near the middle, back side at waters top (semi-submerged) of a 48" 55 gal tank. They are bright, but after several weeks of usage (24/7) we have not observed any problems with our fish. Note: Our fish do have a number of places they can hide from the lights.