This morning my coral banded shrimp was on it's back not moving but it's fin things by it's mouth was moving like normal. The back half of it's exoskeleton was gone and both pincers fell off. It did move a little before i left but not much. Some history, i've had it for one and a half years and the water perams are the same then and now. A week ago i bought a fluval fx5 for my 55 gallon tank ( and a 20 gallon refugium ) it works good but puts out a lot of little bubbles all the time. Can the bubbles have killed it and not the other inverts in my tank. Yesterday i went and bought fluval pre filter and some polyester fiber to put in the fx5. I cleaned and rinsed good with ro+di water before putting it in and that puts us up to this morning. Could it be the pre filter or polyester fiber? Any help will be appreciated.