Yea its film algae, and the photosynthesis releases oxygen. You are going to need o increase your flow fo sho. But the root of the problem is you got some excess nutrients. So switching to ro would help if your tap water has any phosphates or nitrates.
The air bubbles from the algae may get trapped in the sponge and cause a clog in their water ways, causing them to starve due to them being filter feeders.
When i say more flow i generally mean more all around flow around your tank and not 1 giant power head blasting 1 area type of flow.
Hope this helps
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Last edited by typezero; 08-26-2013 at 05:27 PM.
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