Yes, I agree. The one gal jar is just tooooo small. Fry are really delicate. When I was raising angels, I had a 20gal just for the babies. With a 1gal jar--at best you will only have about 5-10 that will live.
I did not rinse the BB-shrimp when I use to feed them, but I had other foods too. Changing most of the water everyday is nice, but the gal jar is still too small.
I'm going to make an assumption, and on the basis of that assumption, disagree with you, Tanker. Assuming an expert on angelfish care and breeding gave a lecture and indicated that a jar is a good way to go about things, and this expert is one who actually created a new line of true breeding fish, their information should, by any reasonable measure, be excellent. However, the problem I see is the same that I see with most religions, in that the human mind tends to get distracted, so, in hearing a lecture, it's really unlikely that *all* of the information provided is retained. In terms of religion, you end up with people remembering certain parts of their religion's scriptures, and being ignorant of others. In the case of presentations like the one on angelfish care, any number of steps can be misconstrued, misinterpreted, or just plain missed. It may have been use the jar until the eggs hatch, and then put the fry into a fry only grow out tank. It may have been dose with hydrogen peroxide if, and only if, eggs are fuzzy. As an example, Bonnie cites a 12 or 24 hour period (that sentence didn't really parse for me) in which hydrogen peroxide becomes toxic, apparently to the fry/eggs. Well, when hydrogen peroxide decays or breaks down, it turns into two things: H2O and O2, commonly known as water and oxygen. That would seem to indicate that it's *less* toxic as time passes, not more.
So, with my limited knowledge (especially in the absence of images), I'd say Bonnie's biggest problem currently *is* the H2O2 dosing, because it's destroying the biological filtration, rendering her tank/jar combination uncycled, and therefore unfit for young fish of any variety. Trust me when I say it happens. I had a happily cycled (0/0/5-10 ammonia/nitrite/nitrate) 10 gallon tank. I've lost easily over 200 RCS because I used H2O2 to kill off some BBA (in hindsight, I should have risked melting the subwassertang which seems to have died anyway by dosing Flourish Excel instead). I've gotten it cycled again, but the nitrates skyrocketed (I was so focussed on getting ammonia and nitrites down, that I neglected some water changes), so I'm in the process of multiple daily water changes to reduce that to reasonable levels, but the rate of deaths have dropped from 10-15 daily, to about one per day. I'd say have some pretty good first hand experience on the havoc too much H2O2 can wreak on a tank. I still use it on my main tank, but the quantities are so low in comparison to the volume of water, that it has no measurable impact on my biological filtration.