Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Needs some tweaking

I love the look of the waterfall but it was kind of a pain to put together and doesn't seem very stable. Also, when I first set it up the water flow was barely a drip because the tubing that connects to the pump is way too long and it ends up pinched shut by the weight of the waterfall no matter how I positioned the pump. After I cut the tubing down a bit it works great, but still falls apart if I move it too much, luckily my skink is small enough she won't be able to knock it over but I would worry with a larger reptile.