its been a while since i came in....anyway my brother is having problems with his "aqua pro 4" he's just re-done his tank(new stones,decorations,ect)its a 180ish ltr(4ft x 2.5ft high, bow front) when turning on the filter water started seeping through the cap, then stopped,10 mins later seeped again...he's put 4 air stones in creating a lot of bubbles i have turned them off, tring to eliminated problems but still happens.