I have a Tunze 6010 in my 90g and it's too much flow. I have to angle it upward or else I get a sandstorm. If you're running barebottem, then let 'er rip. If you have a fine sandbed, then you may have to buy one of the models that will allow you rto control flow. One Tunze and a few maxijets should be fine. A lot has been about the new hydor powerheads, supposedly really good widespread flow for about $50.00. Check the DIY section for a thread on them.