So my male betta Splash has super long fins. My mom had him in kitchen in a 2 gallon tall top fin tank. I told her how bad this is for him because he has extra fins and its hard to swim to the surface. Eventually I told her too bad and took Splash to my room and into my empty 5gallon. I put the sponge filter on the lowest setting so he can swim fine. I have lots of floating plants and logs so he can rest at the surface. But what causes these fins to not stop growing?