Thank you for all the advice, kind of tempted to go down the refigium root after reading a couple of online guides. Seems like a good solution considering I don’t have much head room to get an appropriate sized skimmer in chamber 2.
My skimmer produces a lot less when I'm running floss or fleece filter socks, so I reckon if you can run those and change it out regularly, the skimmer will not be so critical. Still on that size tank I think i would rather run one, even if it is a bit undersized just because water changes are going to be so expensive. Even 10% is going to be 1.2 kg or so of salt.
Refugiums are good, chaeto and a grow light from ebay will get you started (ideally water resistant in case of splashes). I'm just using a simple white LED light on mine
and i'm constantly having to pull handfulls out, it grows so quickly.