dropped a pack of san francisco Brine shrimp mix into about 1liter of water in a 1.5 gallon mini fish tank. put an air stone in there and a thermometer with a small yellow incandescent bulb on top above clear top. Should I leave the bulb on at all times? I am worried the temp will drop, the house is set at 70 but I can't spare an extra heater at the moment, the water temp was 80 when I pored the mix in. Can I raise brine shrimp? I plan on feeding them to my convict and barbs and maybe to my red eye tetras.