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Cloan loaches do better with other clown loaches rather than just keeping one by themselves in a tank. 25g tank would only suit a baby temperarily than need atleast a 75g as they grow pretty fast
If your not looking to get a bigger tank than i would say the paki (yoyo) loach since they dont get as big as the clown.. Not sure what other fishes are in your tank but as long as they arent too aggressive you should be ok