Comment on feeding ...
I feed my community tank each morning on the "eye-ball" size principle and ensure it all goes, normally in 30 seconds, and add half-dozen pellets for the 3 congo frogs, or half a small block bloodworms.
On the crab tank, small amount of bloodworms as above or pellets, then flake as above for the 8 barbs.
In the evening, I give a small sprinkle of flake and pellets in both tanks just to relax the fish overnight and I have a very happy set of tanks and good water with almost no substrate debris.
Same with the goldfish.
Sounds like i am overfeeding here so I might switch to mornings only however all seems cool, AND the fish get greens from the plants which I allow for sacrifice!!
Then after this if I remeber I feed the family