I have a 125 long, run fx5 and cascade 700 with 4 powerheads and uv sterilizer. Have sailfin tang, palatte tang, coral beauty, klien's butterfly, 2 orange spot gobies, sixline wrasse, percula clown, cowfish, tigertail, fighting conch, sally lightfoot 3 hermit crabs, 3 turbo snail, 5 emerald...