Hey 5teady, haven't seen ya around in a while, welcome back!
You've gotten some good info here, I can tell you what I do & why to hatch bbs, plus add a bit of info.
The trick with the inverted bottle is to take advantage of the ciuved top, now bottom. This insured constant circulation, no place for them to settle, which gives a much better hatch rate. I find it easier to use two bottles, cut the bottom of of one to use for the base, with a few rocks added for weight. Use a second, with the bottom cut off, inverted, for hatching in. A picture is worth a thousand and that;
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I run the air line from the top, with a stainless steel nut on the end to weigh it down. No air stone, I tried that long ago & found the brine tears it up in no time. My water has a pH of around 7.7, gH of about 180 out of the tap. To that amount of water in the pic, which is about 1 1/2 liters, I add two tablespoons of salt, one teaspoon of baking soda, and 3 drops of bleach. I can hatch up to 1 teaspoon in a setup like that any more & I get a reduced hatch rate. For 60 fry 1/8 to 1/4 teaspoon is plenty.
At 80F I get a good hatch in 24 hours. I pull the air line, put the hatcher on the table, and shine a light at the bottom. After 5 minutes they have settled, and are all near the light. I use a turkey baster to remove the brine shrimp, they go with brine solution into a 1 cup container. You will have a bunch of shells on the top when you try to remove the bbs. Rub your nose, touch the surface of the water, this reduces surface tension, the shells all go to the side. Skin oils, little trick.
To feed I have a plastic cup with a coffee filter rubber banded to the top. I pull the bbs out of the container with a large dropper, and rinse with tap water, then feed. The rest go in the fridge for feedings throughout the next 24 hours. I change out the water in the hatcher daily.
Don't skimp on the aeration, you want them constantly suspended. A lower temperature will take longer to hatch, you can go slightly warmer for a shorter period, above about 84F they get nasty fast, bacteria. The bleach is nothing more than chlorine, airs out in less than 24 hours, another bacteria reducing trick. Look into decaps, bleach is used for this;
http/www.fishforums.net/index.php?showtopic=280662&hl=
You can freeze any extra as well, I do this when I'm out of town for any length of time, son feeds the fish. Rince well with tap water, place in a ziplock bag, press out the air. Lay this flat on a small pan & freeze, one frozen you can remove the pan.
, after u have a sufficiant amount in the tub, let the tub stand for 5-10 mins and shringe out what ya need.
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