what's a good amount of flow

[Tank_Obsessed]

whats a good amount of flow in GPH for a 90 gallon?

[cloak]

Here's a good article.

http://www.advancedaquarist.com/2003/4/beginner

[Alex T.]

whats a good amount of flow in GPH for a 90 gallon?

What are you or do you plan on keeping?

[mikid]

25-30%-2000-2700gph.....fish.lps
40-50%-3600-4500gph.....sps
thats my recommandation.....

[Dubya_R_X]

Really depends on what you're planning to keep. More flow will tend to keep things healthier though