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If I'm reading this right, you have *a* penguin 350 on your 90 gallon, and you're asking if you should add another?? Is that right?

If so...I'd definitely add another one, maybe another two. That's just me. I believe the commonly quoted rule of thumb for HOB filters is 10x turnover/hour. 700 gallons/hour falls a little short. You can always add another one down the road; you don't have to add it today.
 
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