Heh. That's really retro.
It
does work.
But
1) it sits in your tank
2) it's level goes out of whack with evap from the tank so you are always adjusting it if you don't have a float switch for evap.
A good friend of mine had that same skimmer in 1991 on his clown tank. It helped at the time.
But now I think you would be much better suited with something newer. You can scrape by with that, but you will tinker with it a lot. Some people like that.
A lot of people bash air-stone skimmers these days. But for the record from this old guy, they work! And some of them work really well! I am speaking from experience. I had a couple 24"x6" ones that could still out skim a lot of skimmers. The key is keeping the air-stones clean by scaping them a few weeks in, and then replacing them a few weeks later. You also need a strong air pump and a way to keep the water level.
If you want a good air-stone model, the only serious ones I see these days are made by Precision Marine.
Anyway these days, you'd find a decent skimmer for the money in the Remora, Prism Pro, Nautilus, etc... there are a bunch. Go fish!
