Originally Posted by MFSimmons
I felt bad doing it, but I moved him back into the smaller cup that I got him in because even though his bowl isn't that large, I think the tears were getting a lot worse by him swimming around in the bowl. Was this a smart move?
Yes and no. They may tear a little, but that is sometimes what happens when a betta comes from a small cup to his larger home. He will need time to gain strength when swimming as to not dmg his fins. It happens once in a while with new bettas. He will eventually need to go back into his home, and the sooner the better as being back in the cup is quite stressful. If you cleared out the plants that could of caused this, then go ahead and reintroduce him. Float his cup for about 10 minutes to get the temp right. (If you used his tank water, if you gave him fresh water for the cup, or changed his water since you placed him in the cup, you will need to float it for roughly 20 minutes, taking out water from the cup and adding in tank water.
Putting him in his cup wasn't a bad thing, since you were erring on the side of caution. But he honestly doesn't need to be in there if you have removed the plants. Place his rocks back in, and add in a cave or even a coffee mug will work so he has something to hide in until you can replace the plants.