I paid $100 for a used Bullet 3 a few years back and then another $200 I think for an Iwaki 70. Together its still the skimmer I use on my 325gal system. Eventually I'll replace it with a modern external pin wheel. The Reef Octopus that I've been looking at will cost around $1100 but I wont spend that until I've switched from my old MH to LED. However thats another $4400 if I go Radion. In other words these old technologies still have usefulness and can be purchased for peanuts if you can find them used. For instance I bought a spare Lumenmax 3 pendant with ballast and 6 month old bulb for $50 last year in pristine condition...
The bullet skimmers work okay but they're loud, tall, spit a lot of micro bubbles and require too much electricity. Dez has/was using a Bullet 3 as well. If you do a search you should be able to find out more from him.
I don't have a very high opinion of Aqua C. I used to use an Aqua C Urchin Pro on a 50gal and then 25gal. It wasn't the worse skimmer I've ever used but not very good either.
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