weren't meant to go together, same issue with the other tank, tested the water before the purchase (0 ppm all), had ammonia (0.25 ppm) in the tank when I got home, empty tank (as in no other fishes), cycled 8 weeks, lr and sand. I will do a water change in that one also and get him out of there asap, at least that is the plan... all seem to be doing well now, everything dropped back to normal after I added some bacteria and did another water change (or the other way around rather). Pulled the water out with a clean cup (one cup at a time) and re-added it that way so as not to seriously disturb the sand bed.