I'm so sorry to say I think it's just far too heavy of a fish load for an uncycled tank (and too heavy for your tank in general, see further in my reply). The ammonia will be at an uncontrollable level with this load in a totally new tank.
I suggest you read over this article: I just learned about cycling but I already have fish. What now?! - Aquarium Advice
I am not familiar with a peacock bass but I also fear there are significant problems with your stocking. Here's the wikipedia writeup about peacock bass in aquaria:
"Peacock bass make for great aquarium fish if you were to have a large enough aquarium. The minimum tank size for an adult of one of the smaller species (e.g., C. kelberi
, C. intermedia
) would be 180 gallons, the minimum for a larger variety (C. orinocensis
, C. ocellaris
) would be 240 gallons, and nothing less than a 300 gallon tank should be reserved for 'C. temensis and C. pinima'. They are usually seen in pet stores at a size of 2 to 4 inches, labeled as just plain "bass". Most likely they are hybrids. More reputable dealers who specialize in peacock bass will have the fish identified, and have more rare varieties in stock, or at least pure bass. Tankmates should be other fish that are too large to swallow, such as arowanas
, other large cichlids, and larger members of the Loricariidae
family. The peacock bass produces more waste and uses more energy than a typical tropical fish, therefore significant biological filtration and aeration are necessary. Water changes of up to 25% weekly are required with such messy fish. Feeding should be 2 to 3 times a day for young peacock bass(under 4"), decreasing to once a day as they get older, then as an adult they should be fed every other day just enough to round off their stomachs. Peacock bass can be trained to take pellets, though occasionally this is a challenge. Avoid feeding them live goldfish, unless that is the only thing they eat. Even if they do not accept pellets, they will still eat other foods such as krill, bloodworms, and silversides. The temperature of the aquarium should range from 78 to 84įF. Temperature plays a big role on the looks, behavior, and feeding habits of the fish. Lower temperatures make peacock bass darker because of their slowed blood flow. Lower temperatures also cause the bass to eat less. It has been confirmed that higher temperatures also affect aggression, making bass more aggressive."
Peacock bass - Wikipedia, the free encyclopedia
Apparently these are huge fish and even the smallest of these needs an aquarium of nearly 200 gallons. If I am referencing the wrong fish, I apologize.
4 of these plus bala sharks plus a pleco = a massively overstocked aquarium even with juveniles, and hence your high ammonia levels despite water changes.
My only suggested remedy - take back the peacock bass, as soon as possible. And more water changes while your tank cycles, as per the article I linked earlier.