My filamented fairy wrasse disappeared 11 days ago. Since I only have a 28 cube, he can't have that much area to get lost in for 11 days. It broke my heart. When I cleaned my tank 4 days ago, I vacuumed and swept the tank and sand. He still didn't make an appearance. Today, I bought a purple filefish and a brittle star. Both are hiding. I expected that. The brittle star I will only see at night. Might not see the fire fish for a couple of days, though I know where he's hiding.
People who say that pets lower their blood pressure never had a reef tank!