Hey everyone, I have had my beta Neptune for about 6 months now. He is in a 2.5 gallon tank with a small filter, water heater, and a couple sprouted pothos cuttings. The temp is consistently around 80 degrees. I change the water 50% twice a week and clean the tank every 2-3 weeks. I test the water pretty frequently and the Ph is above 7, ammonia is a little above 0, and the nitrates and nitrites were low like they are supposed to be. Lately his fins have been getting more torn I believe due to fin rot. I started using Stressfix hoping that will help. There’s also been trouble with some brown algae growing on the walls. I posted some pictures of the tank setup. What am I doing wrong?