Misinformation....
Or most likely lack of proper "technique" or set up...
Or trying to get too many things out of a fuge rather than setting a "Goal" and working toward maximizing a particular effect....
I have my "fuge" set up as an Algal Scrubber, with the express purpose of maximizing (forced) growth of Mass Quantities of Macros for the export of malnutrients thru regular harvesting....
I have a clean tank, "0" readings, happy corals and NO nuscience algae...there are also plenty of pods swimming around, but that's a side effect or benefit.
It took several tries of refining the technique to get and keep the Caulurpa happy, but have not had a breakdown since..
Calurpins...are released when trimming or during a meltdown...again, I have eliminated the melt down and run carbon for 24-48 hrs when doing a "harvest"... once a month or so, tends to polish the water and remove alelopathic residue at the same time so it's not like an "extra" step...
Tank and fuge are pretty much maintenance free now (other than regular harvesting) Calurpa may not be for everyone, but it works for me...
On the other hand I run a Bare Bottom tank as well... and everyone "knows"
your supposed to have 4"-6" of sand in there...