I have a Reefer 350 that has been running for about five to six months, with three fish, a mini angel, a royal gramma and a damsel fish. I have tried all sorts of invertebrates and they just won’t survive. Snails, coral, an anemone and cleaner shrimp. My only living invert is a tiny blue hermit crab. I added six a while ago and I am only now seeing one, however they are very tiny, and recently it has appeared to of switched shells. So, now I don’t know if it is the same hermit or a different one... Anyhow, I have checked consistently ammonia, nitrite and nitrate, and have found 0, 0 and less than 10. I checked pH and it seemed a bit higher than 8.3, so I lowered it, waited a day or two and added a snail, which instantly died. I am kind of annoyed at this point! I have good lighting (not that the snail cares) a refugium which until now was running 24/7, as I hadn’t got a timer, and I only add distilled water (though I am in the process of buying an ro/di unit. What am I doing wrong?