Help…

Well, I removed a plant and disturbed the soil. Shrimps are doing fine. Mostly. Some of them are died but they’re breeding like crazy. Have hundreds. (60litre tank. 15gallon) Fish are very shy but they are very skittish from the beginning. (Rummy nose) Will Purigen solve my water problems? Or changing to bottled water. My tap water is very heavy on metals I think…