I had four loaches three died one was still left but was super friendly. So i was worried that he might get stressed so i got anothe loach a bit smaller but
the smaller one started chasing the old one. I read articles on the net the groups of three do fine so i bought a 3 inch loach the biggest of all, they are peaceful to their species but are hurting the other fish like my angelfish and the others. So what should i do to stop them, i need suggestions about why they could be doing such things. Any help would be appreciated.