Otocinclus macrospilus

Otocinclus macrospilus
Dwarf Otocinclus
This is one of the commoner "otos" seen in the hobby, and is an ideal species for the planted aquarium. Unfortunately it can be quite delicate when first imported, and losses are not uncommon. This is usually down to lack of food, as it's a small fish and needs to feed almost constantly, so it's easily starved during transportation. As almost all otos are wild caught, they can be quite sensitive to water quality, too. Many hobbyists report fewer problems if the fish are added to mature, planted tanks, where water quality is stable and there is a plentiful supply of microorganisms and algae for the otos to feed on. Once the fish are past the initial stage and are feeding well, maintenance becomes much easier.