Just a quick question. I have a 55 gal. moderately stocked. I am running an Emperor 400 and a Fluval 203 Canister. I have what looks like very small fine bubbles floating in the water. Do I have enough mechanical filtration? Is the small white bubble looking things a parasite or something? This is my first African setup and I'm not sure what the problem is. PH is 8.0 and I am doing 20% water changes weekly. Any help or insight would be greatly appreciated.