Thanks for the replies- looks like the vote was 50/50! It does give me some more information to make a decision. I don't have any substrate in the tank so flying sand shouldn't be a problem, however I'm probably wasting flow by sending it directly along the short axis of the tank.
I'm considering a Profilux type controller, but for the cost I may not use enough of the features to make it worthwhile. Having said that, having a Vortech on one end and a Tunze on the other may get the best out of each pump as long as I can control them both. I see that it can control Tunzes at multiple flow rates, can it do the same with Vortechs?
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