So FINALLY i have a so far sucessful batch of FH fry(parents both low grade RD, nothing special) but this is my 1st good batch out of 4 trys and 2 miss's. So i got my wigglers out of the plate this morning and into thier own 10 gall for now, what im wondering is how long till they lose the sack and be free swiming? And why does it look like their getting tangled up with eachother on the floor of the tank, not all of um but thier are 3 groups of about 8 wigglers stuck to eachother? Is that normal? Thanks for info!