I see. I am getting 50 gallon tank, which is going to be delivered. Yes, there is going to be frogbit, and Amazon Sword, etc.
OK. No problem with the fish numbers, and yes, there is lots of room for more. I would be concerned over the filters though, relating to water movement.
Filters have two functions: moving the tank water around, and "filtering" the water. These are two very different functions, though obviously related because the water movement means the water is passing through the filter media, thus filtering the water.
Water movement is important and should always be based upon the species of fish. Some need basically no or very minimal water movement, some need very rapid water movement, and there is not usually a middle road which is why it is important to ensure the fish species all share the same needs respecting water current (along with parameters, aquascaping, etc.). You have fish preferring quiet water, which means some movement is fine, but not such that it buffets the fish, and most importantly, they must be able to get out of any current they consider strong, as they cannot "rest" otherwise.
On the filtration, there is mechanical, biological and chemical. Mechanical is simply moving the water through fine media (sponges, foam, etc) to remove suspended particu7late matter, thus making the water "clear" (which is different from "clean"). Biological is the nitrification business, which should not be "encouraged" when live plants are present because they compete for the ammonia, and the plants will win out and do a better job anyway. Were it not for the water movement aspect, one could dispense with any filter in a planted tank, provided the tank is biologically balanced. Biological filtration is going to occur on the filter media used for mechanical filtration anyway, but the point is that higher flow or more filters is not going to help, with plants present. Chemical filtration should never be used in a planted tank except to clear medications; carbon for example does remove some essential plant nutrients, though the carbon eventually becomes ineffective as it adsorbs stuff (adsorb, not absorb).
Therefore, I would select the filter which will provide adequate water movement from one end of the tank to the other, without going to excess. I know nothing about the filters mentioned, nor have I ever bothered in the least with flow rates and gallons/liters per hour, etc...always having floating plants, these issues are completely irrelevant, except that the flow should be geared to the needs of the fish species and not more (or less).
