liang d4 pumps are also very good if you can get them - dangerden now rebrand them so shouldnt be too hard to get one. iirc they are slightly more expensive (but I dont know how much in usd). They are about the same price as an eheim 1250, or £20 more than the hydor over here (which is about 40usd).
While the more channels the better, it also makes blocks more restrictive, so remember that... no point in having a very restrictive block for a nb...
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