Hi currently i rebuild my 90g rimless tank and buy 2 young maroon clown fish first couple days they look ok and swim here and there in tank right now last 3 days they stay always in back of the tank and don't swim nowhere ales only in the back du you think i have problem vith flow in me tank or something different oll me parameters are fine no agrasive fish in the tank 1 chromy and 1 sand siffting goby .I use 1 mp40 in reffcrest mode and 1 koraila 500 gph plus return from sump .