Hey! I'm setting up a Betta tank so I bought a 25 gallon tank for it's self to live happy with 2 Otis Algae Eaters. I have everything ready like plants, heater, water conditioner, etc., except for the Filter.
The employees at the store are telling me I dont really need a filter for the Betta Fish as they are really clean but you just need a small one to filter and move the water for the conditioner. The reason im asking is because the 25 gallon filters are too strong and pound the fish down. (the one that hangs on the back). So im wondering can i get a small 3.5 gallon underwater filter for my tank?