Hi there! About a month ago I got a beautiful halfmoon betta whom I call Yoshi. He lived in a ten gallon tank without a filter, heater, or light. The tank began to get cold and I decided to buy something better for him after I got paid for sure. I went to the store and bought a five gallon tank that includes a filter, light, and I also bought a heater that keeps the water heated from 75-78 degrees.
Yoshi is a very active little betta, he chases his own reflection and swims around the tank daily, exploring his surroundings. I put yoshi insie the tanka nd he was fine for about a week or so until yesterday and the day before yesterday, he began to act a bit strange. Yoshi is now very lethargic, sometimes he is at the bottom of the the tank, his fins stuck to he sides, his dorsal and 'bottom fins' a little retracted. Most of the time he is floating at the corners of the tank, so still that he looks dead sometimes. I changed his water completely, because I read that the water conditions could have affected him, but i still see no changes. He still eats, but rarely responds. He doesn't flare or swim around much, he doesn't even pay attention when I light tap the sides of the tank. What could be wrong? :O
*5 gallon aquarium with filter (that i don't turn on because it is too strong for the betta to handle), light and heater.
*I use Prime water conditioner at the proper amount.
* the tank tends to get a bit dirty in a while due to the black gravel i have.
*Yoshi still eats pellets.
Yoshi when he was healthy!
Yoshi acting strange, possibly sick.