Where did you get your Gigantea? I also got two new small Gigantea last week. Reasonable price from Galactic Coral in Houston. Both arrived in good condition. I put them in my new 65 gal tank in the office. Still full of algae. This tank used LS from the South Padre Island and dead rock seeded in Corpus Christi Bay for about 1 month. Still full of algae, feather dusters and barnacles.
Quick phone pictures. No treatment needed for this pair of twins