i dont think it makes a huge difference, but id probably dose 2 times during the week. 3 or 4 pumps each time, and see how it goes for a while, and then adjust if needed.
i dont use anything. when i do water changes i tend to end up with a damp towel. i take that towel and scrub the glass with it, then quickly go over it with a dry towel. no chemicals, and nothing extra to buy.
the reason being that carbon acts like a sponge. it absorbs everything it can from the water. after a couple days carbon will have absorbed pretty much all it can. so while you can add ferts right away, some of it will be absorbed by the carbon.
thats a chunky perch. sad to say even though i worked for dave genz/winter fishing sytems in the early days, i cant stand staring at a hole in the ice.
my perspective, you really cant over filter. what typically happens if you over filter is that you end up with a tank with so much water flow in it that the fish have to fight to stay anywhere in the tank.
sounds like you are doing okay. when you move them into the main tank, if there are decorations or plants etc, they will be able to get away from each other or stay out of sight when they choose. this may help alleviate this behavior.
they are fun. i have 1 tank of red dragons, pure, but my big tank started with a variety of dragons, and it evolved into pretty much an orange dragon strain. neat to see what the mix comes up with.