How much current for a GSP tank?

[Legacy]

Since my salinity is almost full marine and I don't have any inverts I hope this is the right forum for this question.

My GSP(Green Spotted Puffer) constantly swims in the current of my Aquaclear300 HOB Filter, I also have sediment settling on the rocks. I'm thinking this means I should buy some powerheads/pumps to provide some current... but how much? My tank dimensions are 29"L x 12.5"W x 25"T, how much current should I provide and what products are recommended?

Thanks in Advance,
David

[Brenden]

Generally speaking in SW around 10 times your tank volume for fish only and around 20 times volume for coral. If it is the 37 gallon in your sig you need around 400 GPH

[Legacy]

Your reply was extremely helpful, thank you so much! I'll use that logic when figuring out my setup.