The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
I've got one of those fixtures and I was going to do a 55, but decided to go 40g breeder instead. I would recommend two for a 55 long. I may do two on my 40, but I'll have to see how it set's up first.