Welcome to the forum panther.
I suggest at you stop using RO water. I am well aware that it is pure water but that is the problem. Pure water has no mineral content to hold your pH constant. As soon as you start to process either ammonia to nitrite or nitrite to nitrate, you will see a drop in pH that will stall your cycle. Instead you should use at least partial tap water in your mix. If you have the liquid rock that I have, maybe you want to dilute your tap by 1/2 or even by 2/3. You do not want to have straight RO in your tank though.
Fish cannot live in that water and a cycle will almost always stall when started that way. In order for fish to regulate their water content, they must urinate constantly but in very pure water they can almost never urinate enough to reduce their water content to acceptable levels. (Think about how your finger tips look after being immersed in water for a few minutes. The weird puffiness we associate with that situation is because our own bodies are not able to remove the water absorbed through our own skin.) The fish rely, as do all living creatures, even man, on differences to drive their biological processes. That means that they must somehow separate and remove water and to do so must be able to establish a difference between the fish's blood stream chemistry and the water that surrounds that fish. Even in the best of times, that is a tall order in fresh water, but when presented with an environment of pure water it is more than most fish can overcome. Instead the fish will die a slow death from absorbing water that they simply cannot get rid of.