I rescued this little guy last night from someone who wasn't caring for him properly. He said he didn't do much maintenence for the tank and I saw the water and it was GREEN, and there wasn't a heater in his previous tank. He's very lethargic. He spends most of his time on the bottom of the tank (sometimes on his side not moving but breathing heavily), and when he swims it's mostly must to go up for air, then he swims back down to the bottom. He didn't eat last night but ate two small pellets this morning. I replaced the filter with a sponge filter, put in a heater at 79º, and took 1 gallon from an established tank with a very healthy betta, and did 4 gallons of new water. What should I do? It's saying that the photo upload is failing, but hes a white halfmoon male betta. He currently looks more pink than white, and his tail is much shorter in some sections, with long (maybe the bones of his tail?) sticking out.