Well - I did the dremmel thing - some floated and some did not. Luckily the shaving went into the overflow system and I had a filter bag on one of the pipes, the other did not and now I have shavings in my refugium. Hopefully they will not be a problem. But, it had to be done - finally can clean the tank effectively without it taking two hours. Wish I would have heard from you earlier Tboninc.