My first Convicts

Convict cichlids are from Central America. They are extremely unpredictable behavior-wise, and are real scrappers, so be careful what you put in with them. They'll eat anything, but in the wild they eat mostly algae and some plant matter, so be sure to include this in their diet. The two you have are male and female (male has longer fins and less color; females usually have bright orange bellies and orange and blue fins), and will likely pair up and breed (if they don't they'll fight with each other, so you'll know right away). The best things for a pair of convicts are A) space, B) cover, D) ditherfish. You have the 75, great. I'd scatter all those caves throughout the tank instead of piling them in a corner. I like to use serpae tetras as ditherfish. They are gorgeous, bombproof, and cheap. I'd say for a 75, maybe 20 serpaes. SAE make good dithers too, and if you raise them together in groups of more than 5, they shoal loosely. And they're great for keeping down the hair algae. A male/female pair of BN plecos will breed and keep down the green slime and diatom algae.

Ditherfish are fish that are in the tank with the pair of breeding cichlids to give them a target for their emotions. If there are no dithers, one or both fish may panic and turn on the other and attack it, which can get pretty rough in cichlids. SAE... siamese algae eater. They are unique fish. They get up to 6 inches, so having a big tank like the 75 is great. Overall color is silver and they have a black stripe on their side running from nosetip to through the tail. Make sure the stripe runs through the tail, not ends before the tail fin begins. This characteristic deciphers the true SAE from false SAEs. If you don't get them in groups, they grow up and get really crabby and chase other fish.

Longfin bristlenose plecos... I just hope they stay out of the convicts' way, as convicts are extremely defensive parents. Putting more caves in the tank will help with this because the plecos will be able to find hiding places that aren't in the convicts' territory.

I wouldn't get SAE or any sort of catfish/pleco. The convicts will make their lives hell when they spawn, and those sorts of fish will wind up decimating any potential fry you may or may not have in the tank
If you are looking for other tankmates, I would honestly suggest other very sturdy fish. Things like other sorts of cichlids, such as an oscar or jack dempseys or parrot fish or severums or chocolate cichlids and ect, for fish that will be main focuses in the tank and will also be able to hold themselves against a breeding convict pair. For the bottom, I would also think something along the lines of rope fish or delhezi/senegal bichirs (the other possible bichir species get a little bit too big for a 75, I mean I have an endli in my 75 and while he is doing okay, he really would shine better in something with a bit more space).

Dithers will be dependant upon what other fish you want to put into this tank, but general idea is fast and hardy.

What I would considering doing (and this is just me, just to give an idea) would be to add 1 albino senegalus bichir, 1 delhezi bichir, a nice green severum, and a acara of some sorts
for dithers, if you don't want to plant this tank I'd say 5 or 6 silver dollars, the normal variety not the red hooks, but if you do want plants your other options would be large rainbow fish and larger tetras such as congo and perhaps diamond.

everywhere i turn on the internet has conflicting information!!! (excuse the spelling and punctuation! It's friday and i'm drunk! But i'm in love with my tanks:icon_redf) I like this little pair of convicts, they seemed to be paired because they dance around eachouther and even the female goes after the male for attention. I'm glad i got them but now im cracking my head open trying toi figure out what to get next. It's a 75 so it's not small but it's not big either. I want something else inhere but dont know which way to go. So far im leaning towards some firemouth or dempseys......More to the firmouths although the electric blue dempseys are bitching! I also love cory doras, can they be kept in the tank? God this is hard because i really do care for the wellfare of the fish so idont want to just throw [censored][censored][censored][censored] in here and destroy life. I'm not budist hippy but i apprechiate the hobby and don't like to waste the beautiful fish, you know? I hope someone has experience with this situation that has knowledge to share! Thanks and sorry for the grammar!!LOL, Vodka's nice.