I have four bettas. I have two separate tanks, both split. Octavius and Carl II are in a split tank together. Papi and Theodore are in a split tank together. Each tank has a filter and a heater. I plan on getting a sponge filter. I also bought a 30 gallon tank that I'm working on splitting for all four. Wish me luck on that part. I first noticed Octavius started fading. He was a gorgeous blue/green. He almost looks black now. After a week or so, his fins started looking a little rough, but I assumed it was the poor water conditions he was in over winter break. I had a friend look after all four of them for a couple weeks and when I got back they all looked miserable. No water changes and the filters were off. She sat them under the heater in the house instead of using their tank heater. I thought he just needed time to recover. Now he has these lightly reflective splotches on him that you can see when he gets in the lighting. He has also been hanging out at the bottom of the tank amd his butt sinks when he's eating or going up for air. Really really worried about him the most. Carl II is the fish I got when Carl passed away. (I miss you Carl). Carl was a pretty white betta that had swim bladder disorder, but it was more of a birth defect. I tried the peas, the fasting, the heater, absolutely everything and he passed away. Anyway, Carl II is a deep deep blue and it's gorgeous. I noticed this morning that he has a reflective splotch as well. Both fishies with splotches have them around the head. Theodore is blue and red and looks like he has a mane. I believe he's a veiltail?? I could be wrong? Anyway, even though him and his tankmate, Papi, are separated by a plastic piece with tiny tiny holes so the filter gets both sides, they're getting extremely aggressive. I can hear them hitting things at night. They hit the splitter or the walls and sometimes the marbles. Papi, his tank mate, is blue and red as well but has a more flarey, webbed tail. As mentioned above...they're becoming aggressive. I've monitored the temperature and I never let it go below 72 on bad days but it's almost always around 78 if not one or two degrees higher. I'm very very concerned right now...as I'm writing this, one of Theodore's little mane fins got through one of the holes (this rarely rarely happens). I heard one of the fish hit against something and when I looked into the tank, Papi had somehow taken a small piece of the fin. It was a thin piece from one of his strands but I'm very very anxious now. Theodore is now flaring throughout his side of the tank and Papi seems grumpy in the corner next to his little tree. I could just be paranoid, but all four have slightly bulging eyes. I can't decide on if it's enough to consider popeye, or if I've just never looked this closely at them before. Somebody help! There's obviously something going on with my babies but I can't help them if I don't know what wrong! I'll add pictures...I'm really hoping someone can help me I'm desperate.