my sump, could i improve it

[wickedfrags]

A nice looking design, 7 baffles is always good.

I would also recommend losing the bio-balls. As noted above not required or recommended. In the chamber beside this (5") I would leave this clean/free of macro algae. Lastly, I see you have the return intake angled down - don't do this (as noted in the manufacturer instructions), pumps are not desgned to operate as vacuum cleaners. The design should work well for you.