I have a 75 Gallon nano aquarium. for the 75 gallon tank, i have a Hydor Professional External Canister Filter 350 that turns 280GPH and a SunSun 302 that turns 264GPH. Currently i have in it: yoyo loaches 10 bristlenose pleco 3 panda corydoras 14 cherry barbs 24 gold barbs 7 The tank has been running well since February. I changed my substrate then. it have bunches of anacharis, java moss on some malaysian driftwood, java ferns, amazon swords, and several marimo balls. I attached a few pictures. please ignore the water stains. I've only been doing this for about a year. Any advice would be greatly appreciated!