everything your doing is fine, just keep up with just as you have been doing and as Alton stated "time" CUC can seem slow but they will eventually do their job. i just learned that even adding a stronger light can cause a cycle. when i upgraded my light and added the mini fuge to my pico, i got a big red slim outbreak, the whole tank was covered, it took a month for it to swing back and adjust, water changes and a bag of chemi pure is what did the trick, if you still have my number call anytime if you have questions.