Otocinclus Affinis Catfish (Oto)

The Otocinclus Affinis (often referred to simply as an Oto) is one of the most useful fresh water aquarium sucker fish.  It's a small, peaceful, algae eating machine that looks cute to boot. Hailing from South America this little schooling fish prefers tropical faster moving waters, and groups of six or more. Despite it's schooling [...]