Well here's my opinion. Since they've already 'selected' the tunnel as their home. You might as well leave it there. Shows that it's the most comfortable and safe place for them that's why they chose it.

How many hamsters do you have? Is your cage/tank big? Syrian? Dwarf? Usually when there's that squeeking sound it's fighting. But during the night time when you're asleep they might fight more aggressively. I prefer to keep all my hamsters separated just to be on the save side. The only downside of this is that it's more costly... and don't worry.. as sifu crazymouse and reanne always say.. hamsters are solitary and they won't get lonely living alone.

Welcome to the hamster owners family btw ^^

Of coz only male syrian hav testical la.... Do gers hav testical like the guys?? DUHZ "

& Syrians cannot LIVE TOGETHER.. THey are solitary and best u keep them separeted.. Coz they will fight till DEATH.. they may not fight now, but its a matter of sooner or later ... (yea, learnt quite alot here from sifu)

btw, wad colours are ur syrian? take pic la.

y u wan female? u wana breed them ah? wad colours are the males?

Bleh? You can actually see the testicals? That's not very common.. usually people check for their scent gland and the distance between the anus and the sex organ.