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>>332514 It's a stupid idea to keep a betta in a 25 tall tank because in nature, they don't live in water that deep. Their natural habitats are barely a foot or so deep. Also, if it tends to stay at the bottom, it could be because of a bloating problem (feeding too many bloodworms will do that), and they may not even be able to get to the top, so they may end up suffocating. They breath on the surface with modified gills, so they have to be able to reach it.
As far as a lethargic fish, keep the water warm and clean, and keep the current to a minimum. If it can't get to the surface, lower the water level, or provide lots of plants to rest on when it does reach the top to breathe. Try to feed it parts of a cooked pea. Also, buy some water conditioner and Bettafix. Crowntails are easy to tell if something is wrong by the thickness of the spines on their tails. Bettafix will treat him for any possible diseases he got from the store. Tank size isn't too much of a problem. I personally keep mine pretty successfully in a 2 gallon, but five or ten is good too. Stay away from bowls or little novelty tanks.
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