Not sure about the legs as I just use the wire supports.
As for one fixture on a 55g FOWLR
you can try it and see if you still get coraline growth. IMO
for the cost two would still be better as many believe strong lighting also contributes to the health of the fish.
how big is your system? I have 4 on my 90G and my corals and anemome are trhriving. Like stated above I roughly equate each 56w fixture to a 130w pc
, so I figure I have about the equivalent of 5.7 wpg
. I know the math is not perfect, but the results are proof. I would never put a clam or stony under them, but for waht I have they work great. You can check my profile to see what corals I am keeping. My mushrooms are multiplying like crazy and my leathers have all at least doubled in size.
For what I want to do with the budget I have I do not think these can be beat.