I have added a powerhead,, hoping flow will help for this not to happen again,, besides doing major cleaning overhaul... But the problem is i cleaned my existing powerhead and and added one and both are spitting out microbubbles at times. why does this happen,, andi have had some vortex{tornadic) water flow occasionally,, do i need to be worried about this,,, it has gettone better in the last 12 hours,,, of course just concerned about how it will effect everyone in tank. thanks again for any suggestions.