Just in the last week i have bought 2 acros. A purple and blue one. There about 4" tall. The purple one is doing fine but the blue one has bleached. I saw it yesterday releasing all of its blue symbiatic algae. See, on Sat. my tank got colder than normal. It got to about 70 degrees and usually its at about 74. So i guess from the stress it bleached but not the purple one thank, god. What should i do? Will it recover, if so how long? The same thing happened to my xenia just about 2 weeks ago. The temp went down to 69 during the night and when i woke up it was whiter than normal. It recovered in about 2 weeks. I'm worried about my blue acro. It's so beautiful.