i had the problem too...guess what i realised...do you leave the bbs you were going to feed in clear water for about 5 mins? that is to purge the excess salt in the salty bbs.
i believe the fries of mine which did survive were those who ate less.. they had less salt in their bodies..i concluded it when i saw that my fries that died were very shrivled.signs of water loss--salt poisoning.
IMHO.
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