Had my biocube going for a out 6 weeks. I had one hermit die. The one is out on the rock and the other larger one seems to be hiding out under some rock. I have 3 turbo snails added a few weeks ago and are fine. Did a 20% water change a week and something ago. I did just add some astrid snails a few days back is the only change otherwise. I do have the brown algae now which i know is a startup issue. The water from the bag i did just add to my tank but not sure if that is bad? I also started out with tap water and now replacing with RO
. Any thoughts on the dead crab and about the one hiding out??