my problem is algae. but not your typical problem.
i ran every macro i could get my hands on for a while. it has haunted me for years. the valonia is the last of the problems, and is almost gone. i have no crew due to constant disruption of the rock managing my algae. there are little tufts of greenish/goldenish crap that isn't HA remaining due probably to the blenny making so much manure. (?mulching mowerblenny? heh) but it is fizzliing fast. he swines the flake food i put in about once a week but that is theonly nutrients i add to the system, and i constantly siphon dust and "mulch" heh. i've watched this system go from an overgrown jungle with so much mass, it was feeding itself, to the cheato starving out and no macros get too far before they vanish. HA was gone months ago. diatom snot gone a year ago. i can hang tough in macro id's now

(small consolation right there)
and the thought of starving a blenny once the rapidly disappearing remnants are gone, is something i hadn't thought of. i think i would stick to one just because it is gonna get scarce and i'll have to feed it more. thanks for that perspective.
my tanks are so starved out and cleaned of crap from only maintenance and only 1 fish and couple gorgs for a bioload in 100+gal system. i'm home stretching it on burning out all the nutrients and hopefully most of the spores from all those different macros.
i'm hoping for march as my add corals target date. the 2 blenny idea was a momentary lapse of reason to try and speed this up for the final leg. i don't even want to do it now because of the eventual scarcity of algae that you mentioned, which IS my final goal: minimal algae without relying on the crew as a baseline. the crew will go as preventative once i'm set.
(I must admit, the system has been very stress free just watching the algae slowly decrease over these couple years, but heinously boring)