
I had a hard time finding much information about this overflow so I was a pioneer and now I will leave some information for those of you who are in the same boat. I ordered an S, which I think means "small" and is rated for 600 gallons per hour. Please note I have not yet filled my tank with water BUT I have seen this overflow work on a tank of exactly the same size and water level. is right where it should be. In terms of looks, it's quite elegant. I use it on a 22 gallon Mr Aqua and I'm doing a peninsula style build. It was important for me to have something streamlined and out of the box. I've seen special internal overflow boxes for these sediments and who wants to waste such a feature?! Not this guy! The kit comes with everything you need, including a glass drill bit and instructions. I was able to drill this into the corner of the tank JUST tight enough that I didn't have to worry about something growing between the glass and the overflow. Remember that when you drill, you keep the glass moist and cool and let the drill do the work. I heard Ghost Overflow doesn't fit. So if you're using Bean Animal or Herbie, you're constantly tweaking. I don't think it will be like that. If anything changes in my rating I will update it but for now I am very satisfied. EDIT: Added pics of my reef a year and 3 days later! The same tank just starting to grow.

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