Using polarized glasses to determine if it’s tempered or not is not a good way to tell. Talk to a glass guy before you drill. Tempered glass is supposed to be marked at the factory, but I’ve never seen it. Live rock and a skimmer is the best filtration you can get for sw tanks, although they would require high salt levels. It would also require a separate tank so the rock has a chance to cycle, and any dead stuff to fully decompose. It would work, but first you should get the salinity up for the puffer, you can cure the live rock while you are doing this. I would listen to the voice of experience on the salinity levels, I’m not a gsp expert. Just know some stuff about marine filtration. I would say that I’ve seen plenty of them with ich, I think this may be related to salinity levels, so I would bump the salinity levels up as soon as I got it.
just my 2 cents.
