I haven't owned bettas in quite a number of years, although I used to be very active in the fish keeping hobby and was even a breeder for an extended period of time. I quit about ten years ago because the job I had at the time afforded me the chance to travel and that wasn't something I wanted to pass on. Fast forward to today, a close friend of mine who works at the local animal shelter called me and asked if I would be willing to take in some fish that were taken from a hoarding situation. I agreed to take in ten of the twenty offered. According to her four of them are in proper sized aquariums (5 gallons), but the other six are kept in gallon and a half tank and/or bowls. None of these have filters and since I got rid of all of my old fish keeping equipment, I'm going to have to order sponge filters for all of them. They also don't have heaters, but I cleaned out my old fish room which will be kept heated to 83 degrees year round which will bypass the need to get them right away since their tanks will constantly stay right around 80. Slowly but surely, I'll upgrade everyone to at least 3 gallon aquariums for the long finned ones and 5 gallons for any females or short finned males. I don't know if any of them have any health issues because I'm not picking them up until tomorrow and I also haven't seen any pictures of them, but I'm sure they'll at least have some fin rot issues because that is pretty common due to water quality issues as I'm sure you all already know. Before I pick them up, I'm going to go by the pet store to get the API freshwater master kit, Prime water conditioner, some quality food, and also I'll need to get something to jumpstart their cycles for when their filters get here. Is there any products that you'd recommend over others? By the way, it's so nice to see a forum where people truly care about giving their fish the proper care. I've been reading through the forum for around two hours and the advice given is always spot on with what I'd say. I will admit, I'll definitely need some advice when it comes to planting their tanks, I've never had much of a green thumb, in or out of the water! Haha.