I have had my dwarf zebra lionfish for 2 weeks in my quarentine tank. The water quality is good with 0 ammonia, o nitrite but does have 40ppm nitrate. The fish was doing good but is now staying at the filter and will not go after the glass shrimp that i put in the tank for food. Im not shure if i am doing anything wrong. It was swimming around the tank 2 days ago. any suggestions. Thanks