Why can't I keep any watchman gobies alive

[Tamberav]

Thanks! I was looking into these hatching kits for brine shrimp, how easy/hard is it if you hatch them yourself?

Super easy I bought this one and the brine eggs BRS sells. Chose this one as some of the others use air pumps and I didn't want to deal with that. https://www.bulkreefsupply.com/brine-shrimp-hatchery-dish-brine-shrimp-direct-inc.html

DIY ones are probably cheaper unless you need to buy an air pump, then perhaps not