It's all about personal preference. It might have made your water cloudy because you didn't wash it properly? Keep in mind that you must clean gravel numerous times before putting it in your tank.
I would hold back on the Ottos for now. I usually put in a clean-up-crew of any sort a couple of weeks after the main fish go in so that the tank establishes a bit more, and gives the cleaners more of a job to do!
Moving it up and down is an extremely hard and tiring process, and I for one tend not to do it. Whilst moving it up and down you end up disturbing everything in the tank which is never good. I've always just sucked on the end of the hose, of course that way I'm taking the risk of having a...