8g nano cube pump

[jstdv8]

My mom just got an 8 gallon nano cube and we have it all set up threw a couple corals in there from my tank with some of my sand and water and LR. the pump seams a little weak. any suggestions on a pump that might push a little more GPH and still fit in the back. I don't really want to go to a powerhead if i can help it.
Thanks

 

[tlsohio]

You need to check your current pump to see the gph rating and pick one up with a slightly higher rating. Rio and Maxi Jet both make good pumps. I'd go with one of those. Good Luck!