That is the best advice. If you want to get rid of snails then scrap off those eggs and make sur ethey don't fall in the tank. If you want to keep them then do nothing. If this batch doesn't mature another certainly will. With snails it is only a matter of time. Snails grow slowly though so don't go expecting some big monster snail in 1 week. I grow ram's horn snails and they take months to get any real size to them.