RTBS (Red Tailed Black Shark) can be semi-agressive in a teritorial sence. They will choose a cave or piece of wood that they want to call home, and will them guard it from other fish, often chasing them off quite boisterously. They can nip fins also, so not a great idea with Fighters. This said, quite a few make this stocking work in a larger tank
Some barbs can be fin nippers. If you plan on a Fighter, many will not work. Black Ruby Barbs are OK IME, but things like Tiger
barbs and Melon Barbs will nip fighter fins
Many Dwarf Cichlids are ok, but the medium-to-large ones can be nasty. Any particular ones that caught your eye? Rams, Apisotgrammas and Keyhole Cichlids are all good community fish, but Firemouths, Angels and many larger South American Cichlids and be nippy/aggressive
Most of the African Cichlids (Malawis and Mabuna groups) are off the list for deffinate though. The tearm "Cichlid" covers a very large range of fish
Neons are very good community fish. They may be eaten by adult Angels and other larger Cichlids, so you need to excersize care when looking at larger fish to go with them. They do tend to work with Fighters as well IME.
A lot of people will question my advice on Fighter remcomendetions though, as their bright colours, long fins and occasionally firey personallity seem to make them not mix well with many fish on individual occasions. A lot is down to the individual Fighter, but also, many on here seem to cuddle them a tad too much when it comes to some mixing, like mixing them with peaceful Neons "because one in a million Neons has a bad temprement" is a tad extream on the cautiousness IMO. Yes, you want to avoid agro and nipping in a stocking, but if you wanted to cut it out completely, you'd have to keep one fish per tank
All the best
Rabbut
