melanistius

I have a 100L tank planted with 2 pieces of drift wood and 3 hollowed out coconuts. I have 6 Guppies 4 Glowlight tetras, 4 Red eye Tetras and 3 Corydoras Melanistius. Every time I go to look at my tank or feed my fish I allways see the Cory's hiding and when I clean it they freak out a bit...