flow in a 30G Nuvo

[forenpa1]

I have a 425 gph hydor koralia powerhead near the bottom of my tank and a random swivel head on the pump return at top of the tank- is this enough flow for a healthy tank to keep some SPS (just added a new Green Tree Nepthea) ? Should I replace the 425gph with a larger power head (suggestions welcomed) or get a second hydor koralia- should I upgrade my filter pump- its currently the stock pump that comes with the tank - 450gph (I think)

stock:
2 osc clowns (1 black and 1 orange)
1 firefish
1 yasha white/orange gobi shrimp
2 blue leg crabs
3 Nas. snails
1 Green Tree Nepthea

pH 8.2
Temp 80 F
salinity 1.025
alk 9-10
Calc 400

Light: IM 26W 24" Dimmable Dual Strip
Protein Skimmer

 

[bribo12]

I'd add a koralia 240 as well. Btw green nepthea is a softy not sps

 

[forenpa1]

Thanks !