Hi Im a new member looking for some help I have a 300ltr salt water fish only tank.I have alot of live rock 2 Pacular clowns 2 damsels 1 coral beautie 1 sailfin tang & 10 hermit crabs.Everthing is healthy and water tests are good the tank is about a year old.The problem i have is that shrimp ony seem to survive about 3/4 weeks then just die any help would be appreciated