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Ok so a friend of mine has a couple double star fish but he is worried because one is getting like red and white spots on the top of him what is that he wants to know
Sorry to be the bearer of bad news but if it is one of the stars that can not be exposed to air then there is no hope. You`ll know because he will get wrinkly and fall apart. What kind of star is that. I`ve never seen that kind before.
I doubt there's a way to ensure it was never exposed to air in the catching/selling process. Also most stars like this need huge tanks that are very mature to survive. If your friend has 2 I hope they have a few hundred gallons and lbs of LR/sand.