Today is the first day since I've had Pegasus that he actually tried to eat when I fed him! His own tank should be ready in a few days. I'm thinking I'll have it completely set up and cycled* by Sunday... I'm very happy. For a few days, he was moping, looking pale, staying vertical, breathing shallow, and seemed closer to death. I took EVERYTHING out of the tank and cleaned it. There was a peach gunk on the airline hosing and a film on almost everything. The filter was a mess. I was most trepadacious about thoroughly cleaning the filter, including removing and rinsing the pads, but he seems to have improved greatly. I also moved the breeder box to the other side so he could have a different view. (I had sliced a gallon water jug in half to house him in momentarily while I cleaned the hell out of that breeder box, too.) I also strategically placed a bubbler behind his holding cell (😣) so that it will thoroughly oxygenate one side and some bubbles run under it. With a NEW catappa leaf, of course! * I am not as much as a stickler about cycled tanks as many #betta
enthusiasts. To me, the water is the problem. My tap, even treated, is toxic. I use bottled spring water treated with API Stress Coat. I rinse everything going in the tank thoroughly and wait for the water to run clear. Gravel is the WORST, I regret having black gravel in my first tank. I had washed it 3 or 4 times, and still the water was gray, 3 days later! But I like the filter on the Top Fin 5.5 gallon for Pegasus (same as Deadpool's) much more.
Five gallons is a great size for betta. I would personally not go smaller unless the fish had unusually large fins and struggled to swim, as a result.