Questions on GPH for nano reef aquarium

[Asavorycookie]

Hello I’m somewhat new to the reef keeping hobby. I’ve owned a 10 gallon tank for a while and ive had two percula clownfish I’ve owned them for almost a year. I’ve also recently decided to upgrade to a 20 gallon aquarium because it was given to me for free. Do any of you guys know how much gph I should have for it I’m planning on getting soft and lps corals when my tank cycles

 

[Ron Reefman]

You want to 'turn over' the water in the tank between 20 and 40 times (more or less) with soft and lps corals. So a 20g tank should have pumps that move 400gph to 800gph. And that includes the HOB filter and in-tank skimmer if you have them as well as any wavemakers or powerheads.