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I hatch 2 batches of brine daily for my 4 week old erectus babies. I've tried all sorts of set-ups over the last 3 years and have settled on 20 oz Dr Pepper bottles turned upside down. I find the more funnel shape of the DP bottle improves the hatch rate. I put 2 lengths of rigid airline in each bottle so that there is very vigourous water movement. The hatching bottles are submerged in a small tank filled with tapwater and a heater set @ 82 degrees and a light on 24/7. I also use Embryon decapsulated eggs which hatch in 20-22 hours.
My routine is to feed a batch, wash the hatcher, start a new batch. If I'm late feeding and the naupli are past a few hours old I enrich with Selcon.
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Barb
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