[mocker]

OK so i have a 37 gallon with a soon to be running 15 gallon sump. I have 4 fish in the tank 2 clown, a sailfin and a dragon goby. Every one say that i need a fish with alot of blue in it. I need to know what would be a good fish?

[Kevin W]

Saltwater Aquarium Fish for Marine Aquariums: Blue/Green Reef Chromis
easy fish will not get very big and not aggressive at all

[combs44]

Many people will suggest that a sailfin tang is much too large for a 37 gallon tank.

Chromis typically do better in small schools of odd numbers. Not sure your tank is big enough for that either.

Neon gobies or longspine cardinals are good smaller blue fish.

[unclejed]

You know we all go through this, everything is fine and we need that one more fish to "make the tank". So we add that one more and boom! Ich, stress or what ever! From my experience when the tank is fine, leave it alone. I am reluctant to add a fish and only do so if one dies. I then am very selective and do tons of homework. Just my thinking on this. P.S. Tangs are susceptible to ich due to their thin slime coat.