Loosely based in 20 plus years of this hobby, the original question was regarding WHITE acros/and not ones with pigmentation wich is what you and your buddy Hogan are describing.
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The original post said "Ice white fading to cloud blue at the tips"... I guess it is how you read into it, but Im thinking that this means that it is not "Pure White", and that it does have some light blueish pigmintation (Ice-White). When I hear "Ice White", it brings to mind corals such as have been mentioned that grow well in home aquaria and keep their "icey" color quite easily, right? This seems fair to say and more on topic to the OP's intentions rather than a debate on whether "WHITE" acros exist. Instead you are trolling for a debate on "Pure White" acros. I'm sad that I got involved with a troll on RC, I thought I knew better by now. I agree that "pure white" acros probably don't exist.
Sorry mods, I'm done now.