Otos need a group of at least 6, and the tank must have grown enough algae to feed this number before they go in the tank.
Endlers are not compatible with cories or the tetras. it's either the soft water fish and mix your tap water with RO water, or plain tap water and hard water fish.
Endlers are not compatible with cories or the tetras. it's either the soft water fish and mix your tap water with RO water, or plain tap water and hard water fish.