I got a 150 cube, 4 clowns, 3 (used to be 5) chromies, 2 damsels, an algae blenny, 4 BTAs and a yellow tang. there are also 2 turbo snails in the tank, a couple of hermits and a dozen other snails. I feed about 6-8 shrimp and 6-8 blended clams a week, in addition to wife feeding the fish a pinch of flake every day. Running an algae scrubber that is still maturing and while the nitrates register (somewhere under 5 but definitely not zero) there's not even a bit of algae in the tank. In fact I put in a couple of rocks that you could barely see underneath the hair / other nasty algae and in under a week it was all clean and nice, not a sign of algae. I will make a thread after this scrubber is running for a longer time and proves to be a marathon rather than a sprint runner, but, so far it proves that a tank can be run on light, food, kalkwasser and heavy algae growth in a dedicate / specialized space.
I've also never had such PE with the exception of the times when I brought in "fluorescent water" straight from the ocean.