Hi,
It turns out the regular water pumps (i.e. seperate pump and motor) tend to be more efficient that magnetic drive pumps (the Mags, Eheim, powerheads and etc). The seals are not really hard to replace, but it does take a bit of patience to get them in there.
Mak4s are almost as good as they get (I think they are 90ish watts each) for these types of pumps. There is the iron might pump that is more or less a dolphin. I know of only two people who are using this pump, but both of them are LFS owners so they seem to like them. Iron might are available at spa/pool places in Canada.
Other alternatives...there is the propeller powerhead. It is suppose to do 10000 GPH with 30 or 40 W. And then there is the Wave2k...suppose to work pretty good except for some minor problems (poor belts). Both are more efficient than any pump for its given application.
Say, what kind of a system do you have ? That's an impressive set of pumps for a tank.
- Victor.
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