it says on cooks.com that one tablespoon is = to 3 teaspoonsDonH said:One tablespoon/15 gallons will do very little to help an infection. I forget the conversion from tablespoon to teaspoon (I think it's 2.5 tsp/tbsp). Not sure... someone please correct me. If that's the case, I would add 12 more teaspoons of salt today, and add 15 teaspoons tomorrow, and another 15 teaspoons the day after. Are you sure it's a 15 gallon tank? That would be a lot of salt if it's really a 10 gallon.
Get rid of the live plants and throw some plastic plants so he can hide. The high salt levels (0.3%) will kill your plants and wreck havoc on your water conditions.