My shrimp is now dead also.
My tank has had livestock in it for exactly 3 months now... it was cycled using live rock... In february so they tank was cycled for a month, then was unoccupied for a month before my live stock was put in. I came home to my shrimp dead in my tank tonight.
I did a large PWC
earlier today. I would say 40ish%.
I am starting to get worried. I think I am going to get a test kit tomorrow. Im sure something is high in my tank. If that is the case what can I do to lower whatever is high other than PWC