Heres some info on goldy feeders.
"Feeder goldfish is popular among keepers of predatory fishes for several reasons. You should however keep in mind that a diet that consists solely of feeder goldfish can cause some fish species to suffer from malnutrition. Some species also have a tendency to die from “gut blockage” when fed feeder goldfish. The gut blockage is caused by a feeder goldfish cranium that becomes stuck inside the predatory fish and blocks the passage between the stomach and the intestine.
A problem with feeder goldfish is that they can introduce a wide range of problem causing bacteria, virus and parasites to your aquarium. If you purchase feeder goldfish instead of raising your own, you should therefore ideally quarantine and treat them before you add them to your aquarium. Feeder goldfish are often kept in extremely crowded aquariums or ponds, and this places large amount of stress on the fish. It can also be hard to keep the water quality up during such conditions. The stress and poor water condition means that it will be easier for bacteria, virus and parasites to infect the feeder goldfish. Most predators are quite resilient towards sick feeder goldfish, since the germs will be killed in the stomach of the predator. Problems can however develop if your predatory fish does not consume the feeder goldfish as soon as it is placed in the aquarium. The infection will get a chance to grab hold of the aquarium and the predators can eventually become infected."
Also i forgot where i read this so take it with a grain of salt, but they have fat in them which isnt easy for fish to digest and can become either very obese from them or die i forget, but again my memory may or may not serve me right on this one. He want die from eating two but constant feeding of these may be a problem. Ghost shrimp are a much better alternative, but still should be QT.
Also make sure your tank lids have no holes.
Honestly a bichir tank doesnt need to be very complicated, i know mine arent haha
You got any photos? I would love to see some!