I thought it was gha. I just learned about hydroids and bryopsis so now im not sure. This in a 2.2 gallon i keep dwarf seahorses in. I didnt toss the macro its in because i have a new bush of cheto inbound for their tank to harbor pods. Everything but the horses is gettin pitched and replaced and amphipods and copepods and some brine dropped in. Contamination scares me because i take the macro from here and feed it to my fish in my big tank and i really dont want this in there. So as soon as i noticed this i began planning the replacment.