Moving to HPA

[ButcherBill]

Gonna keep my denix MP40 and convert it to HPA, I'm a complete novice when it comes to HPA so I have some questions...

Assuming I find an inner barrel that fits, would I be able to connect the air pump from my 30ltr Tropical fish tank to use in game?

Will a 4mm hose from Pets at Home be practical (they do come in several lengths)

Obviously I'll either need a portable generator or a long extension cord from B&Q

Thanks in advance,

Gavin.

p.s. I'll not bring the fish tank as that would be silly.