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I have 1 betta and 4 harlequin Rasbora in 10g heated, airpump, filtered tank. Today 1 of my rasbora started spitting out flake food and blood worms and started gulping for air?? The others are fine! What's that from? What should I do?! I'm afraid by tomorrow he'll be dead. I read online there could be a film on surface that can effect the air pump bubbles, but I don't see any film. Had the fish like a week. Uncycled tank.