I agree with the others that doubt your tank is cycled.
It normally takes about two months to cycle a tank.
And you cycle it by adding ammonia until the population of bacteria has grown enough to eat whatever ammonia the fish put out as waste.
You add/feed the tank and bacteria with ammonia by either adding true ammonia little at a time, or .... put something dead in the tank, like piece or raw shrimp, or .....by adding sacrificial fish.
you are now cycling the tank by adding sacrificial fish, whether you planned it that way or not.
You may be lucky and some of these sacrificial fish survive, or some may get sick from ammonia stress, or some simply die of ammonia poisoning from their own waste.
Sounds harsh, but that's the way it often ends up with first time fish keepers that don't understand the nitrogen cycle.
One other FYI, your tank is only large enough for the type fish you've chosen temporarily while they are young.
As adults you will need a tank of about 50 more gallons, at minimum (especially the Nimochromis and the JD.