+1 you should be able to safely cut back on water changes. Something that small and with so many plants should be cycled and safe (you can always do a water test to verify).Scape looks awesome. That's one lucky Betta.
Why the need for the constant water changes? Being that you have a single betta and it's pretty much heavily planted, once every few weeks should suffice.
LOL. Inquiring minds want to know.Anyways, tell us more about your tank!
Does your betta have a name?
Was he a lfs/Walmart rescue or bought straight from a breeder?
Was he bought when the tank was originally set up are has he been moved from a previous setup?
Whats the substrate?
Can you list all your plants?
How many marimos did that tank take?
What type of wood is that?