Hi, I'm treating my fish for popeye with doxycycline (comes from the same antibiotic family as tetracycline), and I read that you can use antibiotics and Epsom salts in the water at the same time so I decided to get some Epsom salts for my betta because he looks bloated. Right now I think it's SBD because he's listing to one side and there isn't any noticeable pineconing.
But is it really a good idea to mix Epsom salts and doxycycline together? After all, doxycycline and tetracycline become ineffective when they bind to calcium, and Epsom salt increases the amount of calcium in the water because Epsom salt is basically magnesium sulphate and the level of calcium in the water increases proportionately to the level of magnesium.
So wouldn't mixing the two together reduce the effectiveness of the antibiotic? Or is the amount of calcium negligible enough that the antibiotic can still work?
Also, if I'm going to use the Epsom salt to treat for bloating, how much should I put in the tank and will I have to do 100% daily water changes?