reflection aggression?

[es355lucille]

My wrasse and clown fish will do the same.....they are very territorial and will attack towards the glass.....but its during the transition from light out in the house to dark....and maybe the lights are changing at that time as well (not sure of that part).....I just assumed the glass at some times must be reflective to them

.....or I have some fish that need anger managment classes!! LOL.