BBS hatchery. the one on the left i got from the store and the one on the right was DIY from 2 bottles.
this is 1/8" ridgid tube, it comes in 3' piece at petsmart or your lfs. cut it into 1ft pieces and on one end apply heat to it and it will become pliable. i do it by the sink so that i can bend it a little and cool it quickly with water and bend it again till it's a candy cane.
after you make your candy cane. you can add a little airline tube with a flow regulator. i use this for both water changes and diy BBS hatchery.
when i do water changes i siphon out any dead larvae and left overs from feeding. then replace it with fresh SW. but i drip the fresh SW back in to make it less stressful on the larvae. check the salinaty of the larvae water everyday and add fresh water to the parent tank water that you add to the nursery tank.
parent tank water from days 3-7...20% water change
newly mixed saltwater aerated over night days 8-12...10% water change
newly mixed saltwater aerated over night days 12-20 up to 30% water changes (alternating days)
heres what i did with black construction paper. on day 6 or 7 i took down the front black paper wall. by the n they should have the hang of hunting and also BBS are bigger.
i put some black eggcrate for a lid makes it easier for water changes and other things.
4" micro bubble airstone under heater
micro bubble air stone on the other side
hope your doing ok