Broadfield
Red Sea Reefer Consultant... Non Affiliated
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Thanks for the shot! Personally, I think an AP700 is only good for 36". I know Kessil says it will do 48", at a ridiculous 18" above the water, but I'm curious what the PAR is at that height. So I think you are making the right decision going with two of them. Although supplementing one of them with T5s would be nice too... but with the challenge of getting the T5 retrofit to physically look appealing hanging over the tank. As far as shimmer, you may lose a little, but two T5 bulbs can't out compete the shimmer of the Ap700.