I got this CaRx in part of a tank buy out and was told its a Geo618 by the seller but someone on R2R told me it might be a 612. Its the older model so the dimensions arent the same as newer models....
With GEO reactors first number is the diameter, second and third are the height.
6 = diameter of the chamber
18 = height of the chamber
Just a guess but you 618 reactor looks to be coming up short.
That is exactly correct!!!!!!
Looks like the classic GEO CR612 with Eheim 1048 circulation pump. Looks like it has been well taken care of. Good grab!
GEO