Welcome rottenapples! Ahhhh... another nice layout. But I got some comments

Your forground and background "looks like" it is the same height. Might wanna slope it a bit either from front left (low) to back right (high). Sort of a triangle slope.

I am not a big fan of back corners but in your case, I guess it cant be help in this type of layout.

Your fish should be more outstanding. See if you can shoot better to bring out the fish colour.

There are too much highlight on some of your plants leaf. See if you can adjust it on your digi cam. Not sure if you got algae on the glass or not. Do check.

Frankie