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One bottle should be enough for now, it just means you start one up immediately after harvesting the BBS. Run it for as long as you need to, usually till the fry accept powdered foods. Splitting the air hose is the way to go. You just need one of these T pieces. or

Don't buy one! If you already have an air pump, then you are 90% there equipment wise. Save that money for the BBS eggs. Google "DIY brine shrimp hatchery" and follow creation of one using a 2L soft drink bottle. It should include instructions on how to hatch the eggs too. The first 2 weeks are critical. If they survive and eat BBS, then you can start introducing other foods.

I never feed my babies before, they rely on biofilm.

Splitting it makes more sense as long as you can disconnect or switch off the line that you aren't using when you aren't keeping the BBS! Having said that though, if it is easy enough to do you can probably do it permanently as even adult fish will enjoy chasing any live food? Simon

Yeah grabbed some soft drink this arvo, gonna head down to lfs tomorrow and grab some bbs for the time being, will order amazon after for a longer term supply. @jayc should I only need one bottle? And how long should I plan to run it? I only have one air pump and it's on my 5 gal right now. I'll purchase one if need be though, spares are always great to have around. (Post note: Could I just split it from the output of the air pump? I might do that actually.) Cheers

Try bee pollen. I use that to feed baby shrimps in rotation with other powdered foods. If you don't use it up, heck, it's good for humans to eat too! You can find many on ebay. Spirulina is good too, as Simon mentioned.

Okay. Do I just buy some sort of kit or something, is it easy? I’ll get something set up over the weekend hopefully. Thanks for the heads up jayc!

In the first few weeks BBS is essential. It's not the same as Frozen BBS. The wriggling movements of newly hatched BBS attracts them to eat. You can try frozen, but you'll find them ignoring it, and the leftovers will just rot.