Is my aquarium shitty?

Be honest, how shitty is my aquarium. I am slowly trying to improve & make it better. Size: 100x40x40 (cm). 160L/42 gal~ Tetra ex 800+ filter Fish: 7 Long fin leopard danios 15 (+/- a few) guppies Albino pleco (not full grown) Super red pleco (tinyyy) 2 panda corydoras 2 pepper corydoras 2 Venezuela corydoras (Corys were in different tanks and got moved together after upgrading to a bigger tank) Also the rimless (& lidless) tank overhangs by a cm or so, would that be a problem? & if yes how would I fix that?