Started my starter 7 days ago. First 2 days I was getting great activity, after day 4 the bubbled have got smaller nd the mixture appears to be like a batter, separating water, to rectify, I have tipped out half the starter and just added flour and placed in the oven (just with the oven light on to create heat as it is quite cool here in Melbourne). For the past few hours I can see big bubbles but no activity in the sense that it will double in size. Any ideas. I'm desperate for this to work. The starter still smells fine and there is no mould of anything like that! Any help would be appreciated.
I lost an old dough given go me by someone to make a multigrain bread by adding self raising flour, so I have no alternative but to make my own starter :)