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I'd avoid mags as they throw off so much heat. When I mix salt in my 32 gallon brute container with a mag 7 it brings the water up to 90 degrees >:( I use Eheim pumps now and am very pleased with their performance.
Go with the grey Brute cans. They come in 20 gal, 32 gal, 44 gal. Also get the dolly - the can twists on and the wheels really come in handy during maintenance and water changes. The Brutes are indeed food grade and don't leach anything back into your rodi. hth.
I agree you should do a water change and lower time your lights are on. If you don't have a phosphate reactor now would be a good time to add one - it really helped my tank.
i've gotten flatworms and zoa eating nudibranches in as unexpected surprises in trades. You learn the hard way to examine everything you purchase and best to qt them before putting in your display tank.
One way you'll know if you have too much flow is your sand will get blown all over. I keep mostly zoas and find if I add to much gph my sand blows around and covers many of my frags and colonies >:(
I put a small sponge in the overflow box on the external side where the drain goes and it quieted it down a bit - but I keep an eye on it - dont want a flood. :'(
I have the Aquactinic 36" T5 - 5 bulb and am very happy with it. I've run TEK lights too - they are a little cheaper but pretty good lights also. I have also used Nova T5 but I have to say the reflectors were not so great. hth