I have two clams residing on rubble rock hammocks on the sandbed in my 150g 60"×24"×24". One clam I've had for 18months and the other is close to a year. I'm running 3 Sbreeflight basics, 2- 48" Ati Actinics, and 2- 36" Ati Blue plus in a floating canopy. Lights are 15"AWL. I'm getting a shade over 200par where the clams are and right under the waters surface center of tank under lights gets an average of 400. This is with my Biotek Marine 3000 par sensor. I've tried bumping up the intensity of my LEDs (connected to my Apex) and have found that small adjustments will tick off my corals, so after many attempts and coral deaths I just left the lights alone! It's like I found the razors edge of where the corals are happy and the clams seem to be as well... My blues max out at 60% and my whites, red, greens, max out at 30%. The t5s come on 2hrs after less come on and they go off 2 hrs before leds go off. My tank usually yields a darkish pink No3 with salifert Test kit that my eyes cant figure out... I presume they are between 25-50ppm and have been this way for yrs. (I've tried vinegar and vodka dosing but lost too much in the process...) My Po4 stays between 0.03 and .1 using low range HC. I used to run gfo cause I thought po4 needed to be 0-0.03 but again I lost too many corals... There is no nuisance algae in my DT other than some small spots of Bubble algae. The chaeto in the fuge grows fast and green hair algae grows on the walls of the fuge as well. I harvest both algae every two weeks. Alk stays at 8.5 and cal is 450 with Avast marine kalk stirrer and dosing pump dosing a set amount daily. Brs 2parts are dosed daily as well to keep things dead on.
Best advice I could give is find settings on your lights that give you at least 200 on the Sb and leave them alone. Corals seem to adjust to less light better than adjusting to too much light. Some of my best colored pieces are in less than normal par #'s. Good luck with it!
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