I started this thread so that people can add groups of fish they have experience with that they know are compatible. I will start. Maybe this would be a good sticky if it turns out ok. I did this because I see so many tanks on here with concerns because people have made a tank that is full of fish that will just naturally shred the fins off of each other.
common fish you need to research tank mates for because they can be aggressive are:
angels
gouramis
most cichlids
kribs during breeding time
sometimes rams when kept in more than a pair
alot of fish that have an eel shaped body
discus can be aggressive towards each other
pacu (gets too big for most aquariums anyways)
I am sure there are more but someone else should add.
I will start with discus because I have them. Good tank mates include those that are not aggressive, can tolerate high water temps and don't contribute too much to fouling the water and are not greedy eaters as discus are slow to get food. Discus are timid and seem happier and healthier with dither fish in the tank. Discus also seem to thrive best in acidic water and that should be taken into consideration. Good tank mates are:
cardinal tetra, glowlight tetra, emporer tetra, lemon tetra, and rummy nose tetras.
pair of rams
cory cats
rasboras, particularly harlequin
There is some debate as to angels and their compatibility with discus because they both come from similiar native waters. I do not support the point that they are compatible because 1) angels can be aggressive towards discus and because discus are timid and slow they don't stand up for themselves and it's hard for them to hide. 2) angels are greedy eaters and will eat most of the food before the discus has a chance to eat.
common fish you need to research tank mates for because they can be aggressive are:
angels
gouramis
most cichlids
kribs during breeding time
sometimes rams when kept in more than a pair
alot of fish that have an eel shaped body
discus can be aggressive towards each other
pacu (gets too big for most aquariums anyways)
I am sure there are more but someone else should add.
I will start with discus because I have them. Good tank mates include those that are not aggressive, can tolerate high water temps and don't contribute too much to fouling the water and are not greedy eaters as discus are slow to get food. Discus are timid and seem happier and healthier with dither fish in the tank. Discus also seem to thrive best in acidic water and that should be taken into consideration. Good tank mates are:
cardinal tetra, glowlight tetra, emporer tetra, lemon tetra, and rummy nose tetras.
pair of rams
cory cats
rasboras, particularly harlequin
There is some debate as to angels and their compatibility with discus because they both come from similiar native waters. I do not support the point that they are compatible because 1) angels can be aggressive towards discus and because discus are timid and slow they don't stand up for themselves and it's hard for them to hide. 2) angels are greedy eaters and will eat most of the food before the discus has a chance to eat.