This article is from the Aquaria: Good (and Bad) First Fish; Breeding FAQ, by Dean Hougen and Elaine Thompson
Another catfish to avoid is the Glass Catfish - Kryptopterus
bicirrhis. While it stays small enough to be an aquarium fish (up to
6"), it is very delicate and should not be purchased by beginners.
"Plecos"
The suckermouth catfish of the genus Hypostomus are often sold in the
stores as algae cleaners. Most of these species get in excess of 12".
Some of the slender suckermouth catfish, such as the Whiptail -
Dasyloricaria filamentosa and the Farlowella - Farlowella gracilis,
are quite delicate species.
 
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