I've got a blue Maxima in my 15g. It's about 18" down from the lights - 1 x 15K, 2 x 22K, 1 x actinic. It looks happy and healthy. No problems here.
When I bought it I put it up really high, thinking I wouldn't be able to get it enough light further down in the tank. However, in the spot I tried to put it, it's foot would not grab on and it kept falling. So I moved it to a small rock on the sandbed and it's attached pretty firmly.
I wouldn't try under PC but T5's are fine.
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