[quote=rroselavy;69386]I also am very happy with my single Vortech (with wireless wave driver and battery backup). Produces enough broad flow around the tank to keep
detritus suspended (and push the sand a bit), and I only have it on at maybe 30% on my 55g.
RRoselavy,
I had the same problem with the undertow and sand moving quite a bit...I turned the finger guard with the solid part facing the bottom. Problem solved.
