Over Skimming and ASM G-2 Pump

hi, i have a 55 Gal Tank with a 30 Gal sump (85 Gal Total), and i just bought an ASM G-2 Skimmer( 200 Gal) without the pump and i have some concerns that i hope you could help me with

1. is the skimmer too big for my setup?

2. Do i have to buy the OEM sedra 3500 pump? or there are other options

i´d appreciate your tips