My students are trying to grow brine shrimp to adulthood in our classroom, but we've been having a lot of difficulty keeping them alive after hatching. We are using a 1.7 L tank with tap water that has been conditioned. The salinity is around 36-37 ppt measured with a hydrometer. We have a heater set at 77 degrees F. We have a small air stone running (we've tried running it periodically throughout the day for short spurts, running it all day but not overnight, running it all day and night). During the day we have a plant light overhead but this is turned off at the end of the school day. The tank has an opaque lid so there's not actually that much direct light (we mostly use it to make it easier to observe the shrimp and also for our actual plants next to the tank). The eggs are in good condition and not expired. Our best run so far is: Eggs hatching on Tuesday, alive and thriving on Friday, but most dead by Monday after the weekend. We've been trying to feed it some baker's yeast (first mixed with conditioned water in separate container till cloudy, then pipetted into the brine shrimp tank). Basically we've been trying different things and none seems to be working very well. Help and suggestions?