I have a 90 gallon planted tank with four small discus, a couple angels, cories, clown loaches, and 16 cardinal tetras. It's about 6 weeks old, numbers all good. Plants healthy and growing, and fish are healthy. Did my weekly 50% water change yesterday and dosed with recommended amount of Excel Flourish.
I have used the moonlight setting (blue only, set at 1 out of 100) on my Ecoxotic E Series every night except two. Last night it was completely dark as I was trying to discourage some discus bullying.
Both times I set it to completely dark rather than using moonlight, in the morning all the fish were at the top of the tank gasping for air. Assuming oxygen loss, I am now blasting the water surface with the canister outflow, and they are all settling back down. I also cranked the lights to see if the plants would start breathing.
SO HERE'S MY QUESTION: Could it be just a coincidence that the two nights I went completely dark rather than using the (very dim) moonlight setting the fish were gasping for air in the morning? My only thought is that the plants might respirate CO2 far more in a completely dark environment vs. a little bit of blue light. Maybe it's the additional Excel after a water change? (Five caps rather than two).
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