Hello,
I have a 7 month old 40gal tank with good parameters. Last week I purchased a Sea hare, a cleaner shrimp, and an arrow crab. All 3 died within like 3 days and I'm not sure why.
Current tank inhabitants: Haitian Anemone, 1 banggai cardinalfish, 3 blue legged hermit crabs, 1 turbo...