I am having a tough time figuring out this problem. I am noticing that there is a film at the top of my 100 gallon SW
tank. I have a frag of zoas, some crabs and snails, 2 clowns,1 cardinal, and 4 chromis. I tested my water and it reads like this
: 11 dkh
I honestly can't figure out what it is. I'm doing my next water change on Friday, I do them twice a month. Any help would be great. Thx!!!