I can't find any info on what's going on with my little guy anywhere, and I'm desperate for help.
I've had Phineas for a little over 8 months now. He was teeny tiny when I first got him, but he grew really well and has always been an active guy until lately. Over the past week, he hasn't been moving around much and just kind of sits at the bottom of his tank. He's been eating, and swims to the top when I feed him, but he hasn't been swimming around much. He's not bloated and doesn't have popeye or any other physical symptoms.
I've tried changing his water and giving him a "quickfix" medicine, but that didn't work. He's all alone in a 5 gallon tank that I keep heated and filtered, and has a fake plant, spongebob house decoration, and a leaf hammock. The only change I've made recently has been changing his dark blue gravel out for white gravel with some decorative orange stones.
Does anyone have any idea what could be going on?