Looking for some input on the importance of surface agitation and minor filter issues.. I have 2 Aquaclears, a 70 and a 30, and I keep getting micro bubbles. The 70's flow has been blowing my fish around some, so I made a homemade baffle using a water bottle. Even without the baffle, I feel like I don't get more than gentle ripples on the surface. I do notice a slight film sometimes on the surface, usually residue after feeding I think. I've even punched holes and made slits in the baffle to improve flow without disrupting the fish, but all it does is give me more micro bubbles. I'm not keen on airstones and not really sure what to do with a powerhead, so ideally I'd like to not add more equipment in the tank. How much surface agitation to I need for proper aeration?? And how do I get rid of these darn bubbles?? (Already using polyfill).