3-4 depending on coral selection
I have 3 Hydras for my 150G peninsula... 60" x 24" x 24". It's been up and running for about a week and I'm very happy with them. Coverage is very good, so I think 3 would work fine for your tank as well.
have a friend's Vega in the middle for comparison: I like the deeper blue LED's on the Hydra.
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Wow. I have three in a 36" tank with a mix of corals. Had 2 for a while and even though ran blues at 90%, still had corals that looked brown due to lack of light in some spots. I even added 2xT5 because I felt the tank was still a bit dark.
Not its been running for a year with growth everywhere.
Call me crazy but on a tank that long, with three units(hydra 28 or old style ones)you will have to compensate with higher % of the LEDs . If I had a tank that big would go with 3x52's which equal 6x 28 hydras
You're making me want to go out and buy a 4th LED like a hydra 52 and upgrade my other 3 Hydras to 52's.
You're making me want to go out and buy a 4th LED like a hydra 52 and upgrade my other 3 Hydras to 52's.
The Hydra 52 is an excellent light. I have in my tank two of the old style and a newer 28. Hydras newer led clusters are definitely really nice.
I truly believe the guidance LED companies give for coverage in most LEDs is the reason many fail out there. I find very hard to keep corals in a 2x2' area doing well with proper coverage like they claim under only one fixture.
Led lights don't wrap around corals as well as t5's, since the diodes are a very direct, down type of light source. That's why corals can lack some color(sps bases with no color).
If you get more modules and better coverage, LEDs CAN give you great results(my opinion!).