Hose tails sizes Fluval Roma 240

[Lupomen]

Hi I am waiting for my tank to arrive and I intend to use an Oase 850 Thermo for the filtration in place of I think the 307 Fluval unit. My question if anyone can help is what size are the hose tails off the base of the aquarium to adapt to the oase pipes ?
Hoping o buy what I need in terms of connectors before the tank arrives.

Thanks

Paul.