DAN! Great choices!
Sajicas and firemouths will make you a happy man if cared for properly.
Is it just them, the acara, and the devil? I still think you should get mr devil out but you've said you will try to do that anyways so good for u!
you're making good choices...
...except calling me spanishgay... I was only trying to give u information- but maybe I came across rude without noticing?
Anyways, Sajicas are especially easy to breed, with firemouths a close second. If you take excellent care of them, with tonnes of hiding spots and water changes, and lots of high quality food (unlike those doinks who get ONE good food and mix it with 10 bad ones and think theyre helping their fish) you will get lots of fry.
A word to the wise- Most of the Archocentrus family (the family to which the famous Convict Cichlid belongs) have extremely fragile skin and scales. Should you place rough rocks or wood in the tank, the fish may acccidentally scrape themselves, resulting in horrible gashes (Ive seen this first hand). No matter the size of the tank this ALWAYS happens. Avoid sharp gravel, lava rocks, sharp slate, any sharp plastics of any kind (plants, etc) and sharp gravel. Otherwise, they are hardy. So are firemouths.
You may consider (once the devil is out) adding Herotilapia Multispinosa a lovely yellowish SA known as the Rainbow Cichlid. Very mellow fellow.
You might also want to look at a few Bolivian Rams (Mikrogeophaegus Altispinosa/Altispinosas) there are two minor variants in the species which may or may not be interbreedable.
All of the above mentioned fish will be fine in a Ph from the high 6 to high 7 good luck.
