I've never had any luck glueing them. they just float away. you could try a shell or soemthing and keep it out of the flow and it should attach. or a small rock, something like that
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.