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Originally Posted by actinic
Logan: When a fish starts darting around like that, there is definitely some sort of reaction to some sort of toxin, usually nitrite as fish can be photosensitive. Was there a filter in the set-up or was it in a "stagnant" set-up? My last SFF lived 5 years in a 5 gal, no filter but had lots of plants. I've never done any water changes as everything tested spot on and I just topped up w/distilled water and added some fertilizer.
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It was a small (gallon max) plastic tank with vent holes in the lid. Tap water, no plants. Changed weekly with approximately 1/3 of the water remaining from the previous change.