03-11-2010, 10:45 PM
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Until you're absolutely positive what this is, you may want to stop adding salt. I don't keep loaches myself, but the information I've come across is clear on never using salt to treat them.
Looking at the photo, I'm guessing that you're not aging your water before you do the water changes. If you look at the top photo, you'll notice some tiny air bubbles along the base of the tail fin. There also appear to be some on the dorsal as well. This is one of the signs of gas bubble disease. If you're not aging your water, I recommend you start doing so. Try googling gas bubble disease for more info. For aging your water, just get a food safe plastic bin that will hold the appropriate amount of water(and will fit under your stand, or some other out of the way place). Put an airstone in it overnight, and a heater if necessary.
You mentioned blotchy skin on some of your other fish. That's likely an indicator of a bacterial problem. Bacterial infections can manifest as sores such as the one in the photo.
It also appears that the vent/anus on this fish is protruding (top photo). If you start to see white or stringy feces from any of your other fish, treat for intestinal parasites.
For any medications that you do chose, read the instructions carefully. Some medications cannot be used in full dosage when treating loaches and tetras. Good luck.