not sure "high nutrients" causes a dino outbreak. ive choked them out and many others have done 90% water changes to no avail.
in the end after testing 72 hours lights out, installing uv, and h2o2 dosing i finally ended it's reign of terror doing a few things that were most effective from my experience with this scourge.
ill order them from most impactful to least.
2ml per hour h202 @ 300 volume gal
or 1ml per hour @ 150 volume gal
that kept it in check.
2nd no white lights. blue lights retarded growth 70% at least.
alternate lighting schedule to nights every other week to throw off their circadium rythm.
siphon all sand out, and replace or rinse it. this knocked it back a ton when done in conjunction with a 1ml per 10 gallons of h202/salt water.
the h202 in the new batch of salt water stopped that explosive growth from doing only a water change.
the sand siphon/ water changes with h202 did the biggest "dents"
the blue light, h202 dosing, alternate light schedule made it so it never had a chance to take hold.
also if you see cyano... let it grow. itll help fix nitrate in the water column.
those are my lessons i learned with my strain.
a cheap dp-4 doser runs 75-100 bucks.
hth