Demasoni are extremely territorial and they are best kept as the only single species in the tank meaning that no other fish should live in there other than themselves. Don’t underestimate their size as the species can be very mean towards the other fish present and there are some hobbyist with bad experience mixing them with convict cichlids in the tank as they will do their best to defend their territory. Sometimes even among themselves, they will shows some level of aggression towards their smaller sized siblings and this gets worse during the mating season as the male will try to coax the female into its chosen breeding spot. The cichlids will only reach a normal adult size of about 2 inches in length and to the pair of untrained eyes; both male and females can turn out to be quite similar. If you look carefully however, the males usually project a brighter coloration and usually look much larger in comparison. However, there is nothing to worry about if you can’t 100% ascertain their gender as you can confirm your observation later during the mating ritual.
It is recommended that the aquarium capacity should be as large as possible (above 50 gallons tank would be nice) so that there is less competition among them going against each other for foods and living space. Usually with the tank volume, that is enough to accommodate at least 3 of the same fish species but serious hobbyist will usually buy more up to 4 or 5 so that they can be sure that they will end up having at least one mating pair. The ideal condition would be having one male fish while the rest up to 3 are all females. If by any chance you ended up having two males in a group, I would suggest removing the less dominant one so that it will not get bullied all the time. Other options would be, you could even set up another active pair if you have an extra tank to spare so that they can reproduce away from the attention of the other competing fish. Don’t worry about having to deal with so many fry because anyone would be tempted to have Demasoni as a pet if you are willing to offer them for free or even better, you could sell them to other hobbyist to raise some cash to replenish your fish supplies or to simply upgrade your aquarium accessories. A fine juvenile specimen can easily fetch up to $10 or more per fish.
The aquarium which houses your pet should have plenty of decor made up of rocks to form large caves and passageways similar like the rocky environment in the wild which they come from so that the fish can hide inside it and feel secure. Sometimes it is better to use a small inverted flower pot instead if you have a difficulty arranging the pile of rocks together. Try to use sand as well as it will make things look more natural and if possible by any chance your local fish shops have some supply of live aquatic plants, you can try to add in one as well. Go for those types which have large leaves such as Anubias but please make sure that you have firmly tied the whole bunch together secured onto a piece of bogwood and then bury into the substrate, or else your enthusiastic cichlids will try and find a way to uproot and move things around as they want to. Plants also make a wonderful addition to the tank as your cichlids will spend their time nipping on the leaves and tearing away chucks of it if they get too hungry. The water which your pet fish live in should be slightly alkaline with pH in the range of 7 to 8 and also with hardness level of between 12 to 13 dGH. Don’t worry if you have problem understanding what all these terms mean because you can always get an aquarium water density meter to conduct the hardness test and to get to the correct ideal level suitable for your fish. You can also read up topics about water hardness with a table to help you understand better.
Just like any other freshwater tropical fish, Demasoni requires constant supply of clean water to thrive and as such routine aquarium maintenance should be periodically carried out. Most cichlid tank that I’ve seen employs the use of high-powered aquarium filter to ensure that the water is crystal clear at all times. That being said, water cleanliness should not be much of a concern because their diet are basically plant-based which means that those water-polluting foods stuff with animal origin like shrimps, fish meal and worms are not needed at all. Your fish should readily accept algae sticks and if for any reason you to decide to use pellets just make sure that the main ingredient contains wheat germ as special meal. There are a few commercially prepared aquarium foods with top brand names like Hikari and Tetra which you can try that I know are specially made for cichlids fish.