I’ve had one of these for a few years now. IMO it’s the best nano skimmer on the market. They did have several customer service issues dating back to when Cadlights went out of business and got bought or absorbed by Mode Aquariums. That might be part of why they are not as popular as some other brands. I ended up getting mine for free because it arrived damaged and Cadlights would not respond to me or PayPal to get it replaced. PayPal finally gave me a full refund and I was able to repair the broken air intake on the volute and make it work. Funny enough I just broke that same part trying to clean the pump which had stopped working. I guess I have to reach out to Mode and see if they’ll just sell me a new pump. I won’t need this skimmer in my new bigger tank but I’d like to have it working for future projects.
Good luck with yours, I think you’ll like it a lot.