Thank you. Okay, so question about salt (Also I posted my params up top on the original post - everything looked okay, except my nitrates were a bit higher than I'd like to see...but it's water change day anyway, and I'm going to do a big thorough gravel vac and boil my decorations and get rid of the java ferns that hated the high temps and decided to melt, lol).
Anyway, yes back to the salt -- I have read that corys don't do well with salt and are sensitive to it -- is the 1 tbls/5g a safe amount for the corys, or should I halve it? Also, can I add it directly to the tank, since I'm treating the whole tank? Often when I work with salt, I will just do it in a QT tank, or it's one of my bettas that live alone and are in their own tank anyway. This will be the first time I have to use salt in my community tank. I also know that generally 100% water changes are recommended because salt compounds and can't be completely removed unless a 100% water change is performed. Is it unsafe to use the salt in my community tank? Would I have to try to do 100% changes in that tank with all the fish in there?
I have always done salt with bare bottom tanks that I can just dump out and rinse/refill, repeat. Haven't ever done it with substrate in.
Also, I have some methylene blue on hand (I lost a betta to velvet a few months ago and didn't have any medicine on hand, so I went crazy and bought ALL THE THINGS for my fishie pharmacy, lol), and I know it dyes crap blue and generally is used as a dip. Given that I can't dip all of my fish at once, should I just quickly dip the ones that I do see issues on (in this case, the two corys)? Should I halve the dose for that because of their sensitivity?