My boyfriend and I just got a new betta fish three days ago. We got him a 2.5 liter tank along with conditioner for the water, freeze dried blood shrimp, and pellets for betta fish.
He seemed fine the first few days, but now he's gasping for air and sinking to the bottom of the tank after trying to swim. I haven't seem him eat at all since getting him, and his colors have dulled down and his fins are ripping.
I keep the temperature of the tank at roughly 79-80F and I washed the tank thoroughly with hot water before putting him in the tank. We did the bag trick to let him adjust to the water.
I recently had to change the water because for some reason, it got really milky and oily looking.
Please help. ): I have a heater, but I've been keeping a close eye on the temperature.