Hey, Alyssa, It's Nancy from SFBaaps, the algae nut, lol. Nice to see you here!
Also, 85F is extremely high even for tropical loaches. And some loaches are cooler water fish, such as dojo loaches, which shouldn't be in water any warmer than 75F maximum.
I would get rid of the potting soil and put in eco-complete or some other sandy substrate that is aquarium-safe. Rinse it thoroughly before putting it into the tank.
You can order fish from Drs. Foster and Smith, either online or through their print catalog, and you'll get better quality, healthier and hardier fish than those sold at PetCo. F&S is a great outlet for aquarium supplies and equipment, also.
What is the pH in your tank? That could be the problem, as well. Your water might be too acidic or too alkaline for loaches to survive. API puts out a good test kit for pH, and you can order that through F&S.
I would bet your problem has to do with either pH or the make-up of your substrate, or possibly both.
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