I have an Aqueon water changer with gravel cleaner, and I am going to use it tomorrow to do my first water change. I have little fish though and am worried they might get sucked into the tube or stress them out too much. Especially my corycats and otto. Will they move out of the way? Also, I want to eventually want to get some cherry shrimp but I'm certain they would get siphoned out with the gravel cleaner. Any info would be greatly appreciated.