I learned that lesson early on Deb. My tank originally started off with just powerheads and internal fluval rippling the surface. The clowns and mandarin and inverts and corals were all fine. Then I started adding oxygen-demanding fish and had problems. Added a new jawfish; dead next week. Added another; dead next week. Added a flame angel, dead next week. Added a tang; dead next week. Added a replacement tang; dead next week. It was depressing. All those fish were perfectly healthy when I bought them. My water parameters (ammonia, nitrate, etc) were great. Then I added a skimmer and added a tang again; alive next week, alive next month, alive next year. Added a flame angel; alive next week, alive next month, alive next year. No more mysterious deaths.
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