ok so i have three frags of zoos two green sets(10 polups) and one yellow(5 polups).
i got them all at the same time about 7 weeks ago. the two green ones have doubled in # of polups....the yellow one has not grown any new polups and has been closed for the last 2 weeks. i have been looking at night for critters/snails eating them at night or day, and i cannot see any. i moved the frag and left it alone for a few days in a new location and it still wont open. even tried the sand and high up near the lights.
my levels are all good, temp stable, the only thing is i just got a refractometer and found out my SG
was up to 1.026 and i lowered it a few days ago to 1.023.
any ideas why just one frag would be closed for this long?