Sparkle has been in a 5.5 gallon filtered tank with silk plant+flowerball cave+luster gems as substrate for about 2 months now. No heater yet...temp stays correct since weather is warm.
At first he seemed to enjoy the filter flow and would even hang out by the filter intake. But recently, he seemed to not like it anymore. So I removed it for a few days. Yesterday, I felt that I actually should have his tank filtered so I put it back in. Before I even turned it on .... he began FLARING at it like a crazy-man

I watched him for a while and he kept flaring at the black output part that hangs outside of the tank. I thought ... holy crap...I better get it out of there before he blows a fin or something!!!!
I took it out and now wonder if I can keep him healthy in this size tank without it being filtered. I read so many threads and posts about filtered and non-filtered tanks....I am confused
I do a siphon gravel 50% to 60% water change once a week and refill using water conditioner. Will I need to do more water changes or is this okay?
BTW ... He eats OmegaOne SuperColor Pellets ... finally got him off flakes ... less food debris in tank ... YAY !!!