Bob,
I have kept both species of loaches mentioned above and let me asure you none will ever achieve their natural growth potential. Most clown loaches sold in the store are about 1-2" in length. The yo-yo loaches come even smaller. In the 5 years I've kept a group of both species none grew past the 2.5" mark, they did get bulkier but not much longer. I've seen some larger clown loaches at SIG meetings and at about 4-5" they were over 10 years old.
The choice is entirely up to you, we're are here to provide some suggestions to your problem.
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BAS - Educating Aquarists Since 1911.
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