One thing you may want to consider, is that a dojo loach is not really a tropical fish (its from China and Japan), so keeping it in a constant warm temp is not optimum conditions.
Maybe acquiring another tank, setting it up without a heater, for other sub-tropical/even temperate water species may be better.
Examples of those non-tropical Asian (if you care about being geographically correct) species might be white cloud mountain minnows (China), rosy barbs China), paradise fish (Korea/China, or even goldfish.