I buy fish from Wal-Mart if I have to. No one else in town had Otocinculus cats and one place actually said, "Oughtta what?" So, go figure, I picked up three of them from there and they seem to be thriving well in my 29g planted tank. So, I am part of this "evil empire" now, having fueled its lust for filthy lucre
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Having said that, obviously Wal-Mart has its problems. Of course, so does my LFS. They both overstock, they both kill fish and they both want to make money, such is life. I'm over it. Now, on to your problems, cougar.
You're doing the right things so far. I would go ahead and put a heater or two into that sump. The higher temp makes the ich more uncomfortable from what I understand, and more likely to abandon a host. Pull the gavel and all, as others have said. You can treat with salt, if you want, or you can treat with ich meds. The meds are probably your best bet at this shot, since the chiller is going to keep the temp sub-par for proper salt/heat treatment. Still, the meds combined with the warmer temp will hopefully reduce the amount of time you have to dose and get the fish over it more quickly. If treating with meds, remove ANY activated carbon in the filter system.
Another option is a diatom filter (I think that's the one) but I have no idea what your budget for this little project is. I am assuming it's likely on your dime if Wal-Mart doesn't carry the item, and I've never seen a diatom filter at Wal-Mart. Hope this helps and you stay strong.

Having said that, obviously Wal-Mart has its problems. Of course, so does my LFS. They both overstock, they both kill fish and they both want to make money, such is life. I'm over it. Now, on to your problems, cougar.
You're doing the right things so far. I would go ahead and put a heater or two into that sump. The higher temp makes the ich more uncomfortable from what I understand, and more likely to abandon a host. Pull the gavel and all, as others have said. You can treat with salt, if you want, or you can treat with ich meds. The meds are probably your best bet at this shot, since the chiller is going to keep the temp sub-par for proper salt/heat treatment. Still, the meds combined with the warmer temp will hopefully reduce the amount of time you have to dose and get the fish over it more quickly. If treating with meds, remove ANY activated carbon in the filter system.
Another option is a diatom filter (I think that's the one) but I have no idea what your budget for this little project is. I am assuming it's likely on your dime if Wal-Mart doesn't carry the item, and I've never seen a diatom filter at Wal-Mart. Hope this helps and you stay strong.