Looking good but I also think they may need some more objects in there. Maybe some live plants like water wysteria or amazon swords? I haven't killed mine yet so they must be easy to care for plants. I like the water wysteria because it can float and the roots grown downward, making it look all jungle like
I have a 10 gallon divided 3 ways but I do not have a filter. I use a gravel syphon which i dont think actually cleans the gravel but its great for sucking the water out of a 10 gallon. Makes water changes a breeze.
Here is a pic of mine. I want to get them each a taller plant or betta hammock so they have something to rest on near the surface, and maybe get them another hiding spot, like a cave or something. I kinda want my coffee mugs back LOL