I'm going to be direct with my comments on the serious issues here involving the stocking, and this is solely because of my concern for the poor fish.
This tank is way overstocked, or perhaps more correctly stated, it is stocked incorrectly which makes it overstocked. The cichlids are an issue just waiting to explode. Two male Bolivian Rams cannot be kept in a 76 liter (20 gallon) tank. The long-fin ram, which I assume is a variety of the common or blue ram since I am not aware of Bolivian Rams being selectively bred for finnage though that is possible, is not going to work; a male will constantly be in trouble with the Bolivians, and a female likely the same for slightly different reasons. Males of these species are very territorial, and each will readily consider the entire tank space as "his." I had a Bolivian Ram male in a 5-foot 115g tank for ten years and there was no doubt whatsoever that he considered the entire space his, and it was very heavily planted. The two male Bolivians will at some point both try to exert their dominance, and one will likely be hounded to death in short order. Same fate likely holds for the other ram.
Corydoras must have a group. Kept on their own, or in small numbers (anything below five, even five is questionable) means stress, and stress slowly weakens a fish, with no external signs until it is too late. This stress also makes the fish more susceptible to9 disease which it would otherwise be able to deal with. They also need a sand substrate, mentioned because it is important for the cories.
Kuhlii loaches are also shoaling fish, requiring a group; no mentiuon is made of the number here, but it should be at least fivbe with more always being better. Not good with cories though.
Cardinal tetras are shoaling fish, so again a group, here five or six can work (this species is rather unique in this, I can explain if asked) but in an aquarium a larger group is preferable.
Mollies must have water with a GH above 12 dH. Other livebearers need moderately hard water, in the 10 dH and up, but mollies are especially sensitive to the lack of minerals if this is softer water. Cardinals, kuhlii loaches, cories are soft water fish, with some degree of moderateness depending upon the GH.
All of the requirements I've referenced above are part of the inherent genetic makeup of the fish species. That means the individual fish "expects" them, and won't understand why they are not present, which is more stress, weakness, long-term.
