I have just looked into my tank and seen some tadpole like jelly looking white and black beads stuck to the heater, one of the angel fish has eaten a few, but got attacked by another angel fish and now they are both hovering around the heater, what is this, never expected this, and do not know what to do. Do i leave them alone and wish for the best, or do i seperate them....if so what do i need to buy and where from....thanks in advance