This morning tank had 3 dead tiger barbs and the rest of fish were at the top gasping. Why all of a sudden the lack of oxygen? Did a 20% water change right away to get oxygen level back up everything seems fine. Are the plants using up that much oxygen at night? Or did the fish load catch up to me? Any suggestions as to why this happened?
So you've had it with 40 fish for 6 months? During that time the fish have grown.
-- Stuart Halliday
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