YES YES YES - that's one of the reasons I stopped using the python. Not to mention I needed 50 feet of hose to reach my kitchen sink and I had to turn it on full blast to get the right amount of suction, then the sink would start to overflow (it did once, what a terrible mess on my hardwood floors). It doesn't have a filter to keep the fish from getting sucked up into it and almost all my fish have a sick curiousity about what's in that hose. I always got them out before they got to the sink but there were some scary moments. I now use a much smaller tubing and the water goes into a bucket - it has a filter on it that will keep any fish from getting sucked up. I do have to stop and clean it out from plant debris and the fish are still curious but there is NO risk. I was spending so much time getting all the water out of my 50 foot python after I was done with a water change, that suctioning water and debris into a bucket then dumping it into the toilet is actually a faster way of doing a water change. Of course I only have 29 gallon tanks - perhaps I'd feel differently if I had a 100 gallon tank - but I don't think so. When I add water back in I put in Prime first and sometimes Stability and add water to the bucket from my bathtub - I can get almost the exact same temperature as is in the tank. I add 3 gallons at a time (because I'm old and sick and that's as much as I can carry LOL) - it mixes the chemicals into the entire bucket. It takes between 5 and 6 - 3 gallon bucket fulls to do a good heavy water change. And at 3 gallons at a time it's not that heavy or exhausting for me. Just remember to check the filter and wash out any debris that might block the suction. I LOVE this method of water changes rather than using the high risk, pain in the neck Python.