Hey, everyone! So I've run into a little bit of a pickle lately with my sw
aquarium. About 2 weeks ago, I purchased 7 Hermit Crabs (4 Blue-legs and 3 Scarlets) to aid in keeping a new diatom bloom in my aquarium at bay. They were drip acclimated and placed into my tank upon coming home. About an hour later, I found the smallest blue-leg out of his shell and floating around the water column, dead as a doornail. I thought it would be just him, but I was wrong - ever since then, the other crabs have been progressively dying for an unknown reason. To add to that, I am starting to get suspicious of my water chem test results being accurate. Here is info on my tank that could lead to the solution:
I purchased the crabs (and all other tank inhabitants) from a Petland store some miles from where I live
I use an API SW
master test kit to test the water (I know these are controversial, so maybe that's part of the issue?)
Test results have been the same for a few weeks (pH: 7.8, Ammonia: 0, Nitrites: 0, Nitrates:0), and the tank's been set up for about a month and a half.
It is a 55-gallon aquarium with other inhabitants as of now being two Ocellaris Clowns, a YWG, a Royal Gramma, a Cleaner Shrimp, and a Fire Shrimp.
All feedback and tips are appreciated!