i just got the moss ball from am ember here, and plan on finding something to fill out the back left and middle.. the "onion" plants i have in there aren't gonna last i don't think. thinking of some ludwegia or something.
i've modified the pump to be under the filter box with an extended hose and then put 500g of bio blocks on a stand in the sump. also added a purigen pad, but it probably isn't really needed. (for the matter, 500g of bio blocks probably was not needed