The All-Pharmaceutical Tank (Satire. Please don't do this.)

[taricha]

This could make the “number needed to treat” in the hobby rather large for algicides. The strains of nuisance algae being passed around the reefing community might have been already narrowed down to the very resistant strains.

If you ever need really resistant GHA that is also distasteful to all herbivores, I got you covered.