+1 on the background!Looks good. Two suggestions. A piece of cheap black or color of choice poster board makes and easy background to hide wires and the filter housing. Two, that seems like a very large filter for a betta tank. Bettas prefer slow moving water so just make sure there is not a strong current. His big fins take a lot of energy to keep him going so a strong current can be exhausting.
I have a 30 gallon bowfront in my living room. It had no background. Seeing the paneling behind the tank was really annoying. After a week of looking at it, I became irritated enough to tear the tank back down, tape everything off and spray a few light coats of black Krylon on it (took 4 or 5 coats to get a good solid background).
Completely different looking tank now!
The poster board would be quick, cheap and easy though.
Not sure how I'm going to handle the 125 now. It has one of those cling type backgrounds that almost looks like an underwater forest.
It blends pretty well with the tank, but I would rather paint it.
NOT breaking that beast down!
A pint of Krylon, a real skinny roller and a lot of patience is in my near future I suppose,
Congrats on the plants. It looks like a nice setup.