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I honestly don't know. The ones I use are completely submersible. If you look around there are a lot of different solutions that people use for lights in the back. Mine is only one, and it works for me so far. There are also LED lights that are sold by Nanotuner and a couple other websites that...
http://www.oznium.com/led-flex-strips
This is the company that someone else bought LED from. Not the ones that I have but it is certainly another choice.
I don't think the tanks are as bad as that. We have two a FW 55G and the 24G AP. Both have florescent lights, total of 5 pumps/filters two heaters and my total electric during the winter is roughly 100 dollars. I think MH lighting is out for me. T5 or LED step right up. Chillers I would think...
I got it on eBay. I have another thread with the link to the seller but if you search under eBay for LED and aquarium you will find them. I think total it was like 28 bucks ... I got the longer one 10 LED. There are shorter ones a bit cheaper...he will give a discount if you use my email and...
You cannot see my fuge at all unless you lift the lid and lean way over and look in the back. Check out my thread on my AP. I used LED lightbar in the back..no heat(minimal) and cheato has done fine.
I would put some sort of filter medium in the back to surface skim. The live rock privides the surface and the deeper structure for both types of bacteria. You don't need a light for just rubble without any macro algae used in a traditional fuge. It is more of a biological filter.
Three fish in...