Seachem Laboratories Impulse 400 Multi-Function Aquarium Water Pump Puffer Fish They are named spiny eels

They are named spiny eels because of the spines on their dorsal fins

so usually one specimen will do fine unless you have a species only tank or a very large setup

They are social creatures and do best when kept in groups of at least three

attitude and breeding abilities

just suck any remaining pellets out and keep your tank clean

Seachem Laboratories Impulse 400 Multi-Function Aquarium Water Pump Puffer Fish They are named spiny eelsThe Impulse is a quiet, energy efficient, multi function pump. It is ideal for fresh and saltwater aquariums, protein skimmers, indoor fountains, water cooling and all similar submersible and inline applications which require energy efficient, ultra quiet performance. The Impulse is equipped with a synchronous motor and an advanced impeller, ceramic shaft and bearings (stainless steel on the Impulse 400), and an adjustable flow rate. Multi size hose