On my last fishing trip I caught a lot of small carps, sunfish and perch. My question is if these three species can coexist in an aquarium. I know that perch is very sensitive to nitrate levels in the water, but carp and sunfish are practically able to live everywhere is there's water. I'll post the pics of the fish in question so you have an idea about the size, the aquarium is 40 liters and I plan on putting one specimen of each as a start.