conrad do the temps where you are effect cycling ?
its the only reason i can think of for the issues im having
I seeded my edge from another AC20 that I had on another tank, and I didn't add anything until it cycled 100%. I added 3 RCS first and they lived just fine, and then added 7 babies. I can't find one, but I think they were eaten by the bigger RCS. Then I added a pleco and two oto's and everyone lived.
I have never had a problem with temps affecting the cycle, but I might not be the best person to answer that question. My temp has been at a steady 74ºF. If you're doing water changes with water that's too hot or too cold that's one thing.