Apparently there are a few different "compositions" that go into making egg-crate. I think one of them is more of an "Acrylic" material than plastic so that's probably better.
No it wasn't the only spot. I had 2 egg-crate racks and they were the only places that had more than just a pinch of it. It was obvious even to people that knew nothing about reefing or GHA that the "racks" were growing it very well. Once I took all of the egg-crate out the GHA was gone in a few weeks from every where. It couldn't be just a huge coincidence.
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