11 March 2017
I'm considering taking out the flame moss patch in here- it just keeps accumulating mulm. I could start another stone in the main tank... Thinned out the spirodela polyrhiza as usual (and threw the culls into the window tank). Lifted out the sponge filter for a rinse and saw that the bio-cubes I have in its base were quite brown. Maybe clogged and no longer very functional, or impeding flow? I took over half of them out, discarded and replaced with some of the ceramic cubes out of the main tank's canister.