Thanks for the information. I don't use tap water. I use drinking water with no chemicals. I actually had more fish in the 29 gallon. 7 years I have had that tank and the red line (George has been there since day one) I actually had 3 and lost them last year. I just recently read that he "is" like a torpedo, they way they swim. The rosey barbs gave my originally Angel Fish, (I had for 6 years) stress, she would hide and stay at the bottom of the tank. I have 2 small neons in with the betta. The 2 1/2 gallon is usually fine.
I will do the cleaning and get some more plants. Only have two live ones, the rest are fabric. Don't like the plastic ones in there. I use to have a red claw crab and an apple snail about other fish. Have always had this problem. Have experience, ick, infections and fungus and bacterial problems, depending of what fish I had through the years. I have to purchase a sick tank for that purpose and for holding new fish before introducing it to the bigger tank. I am done right now adding fish to the 29, but would like to add more snails or something to the 10 gallon.
I am learning as I go. Had a craw fish that laid eggs and grew too big in the 10 gallon tank. Traded him/her in. Interesting item.
I have a great exotic pet store and knowledgeable.
Again, thank you.