I know how you feel. My silver belly wrasse loves pests so, I hope she has my back if something takes place. So far, she's been well behaved with the sand issues. Not sure what has changed. No sand storms, sand spitting stopped. I'm glad thank God!I'm thinking it's sand. That one bigger grain just had some blue lines running though it - most likely the shadows showing up weird from the filter they used. I'm not completely worried, just saw it after I bought it. If it looks bad, I'll toss it - it was a gift card purchase so no money lost. I don't want to add MENs to this tank. It took such a toll on the 75.