i recently bought a 30 gallon tank with sump, skimmer, light, fish, lr, sand...... pretty much a fully setup tank but its has a little gha problem. the guy just didn't have time for it so it wasn't in the best shape. I've had it for about 2 weeks and have been doing 5 gallon water changes every few days (4 times so far). i have only been feeding the fish (2 clowns 1 watchman goby) every 2-3 days, he said he was feeding everyday and the skimmer wasn't even running when i went to get it. does anyone have ANY advice on how to get rid of the gha that i may not know? any advice will be greatly appreciated.

