I think you could get a common pleco in that tank. They are big but they like to come out.
AQUAKING
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/www.scotcat.com/factsheets/pimelodus_pictus.htmCommon plecos tend top get to about 20 inches. They are quite slow growing. My next door neighbour has a 7 year old one that is 9-10 inches. They are peaceful, she feeds hers on cucumber and algie pelets.
AQUAKING
