Yes you do depending on the species you get. Hypancistruses generally stay small but cost more. A rubberlip would be ok as would be 2 clown plecos. Even a BN would do well in a 29 gal. Check planetcatfish.com for info on plecos. I would recommend you check out L104, L129, L187B, L134, L340, L270, L33, L66, L201, L199. But there are many more. But that is a lot of bottom dwellers and makes for a boring tank during the day.
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