I bought my red double tail betta a few weeks ago. He lives in a one gallon tank (my mom insisted that it was pleanty big enough, I'm not yet convinced, but he seems to be doing okay) There's a filter and a heater, I keep the water at about 76-78 degrees. I use a water conditioner and make sure the pH, KH, GH, Nitrite, Nitrate, and Ammonia levels are where they should be. And I keep him in my room (away from the vent).
I visited my grandparents in Ohio this past week and I couldn't take Ryuu with me.
So I brought him over to my family-friends house to take care of him (feed him, check the water, etc). I just got him from their house today and he seemed to be doing great, until I looked at his fins.
The lower tail fin is split to the middle, which had me really upset for the rest of the day. I brought him home and did a complete water change. He's doing fine, no strange behavior that I can see. He does have two plastic plants and some Roman ruins colums. All of these are very smooth and have abosultely no sharp edges. I put large smooth pebbles at the bottom of the tank that he seems to like a lot.
1. Should I be really worried about his fin?
2. Will his fin grow back to the way it was before?
3. Should I add or do anything to the water besides the water conditioner?
I'll go to the store as much as I need to and I'll buy whatever I need to help him heal.