maybe can add one turbo or astrea snail to ease your itch
that's what I did. ... may not be a recommended practice
liverock already in? dose bacteria additives to boost bacteria growth
to control phosphate and silicate that support your brown alage growth, for a simple quick fix, you can get seachem phosguard and put in a filter bag at a high flow area ... e.g. can get from AM, phosgauard 250ml + bag ard $12 or less.
If you ok with fluidized reactor with rowaphos, then by all means.