Chain tension and tensioning a chain

James1822 sorry to resurrect this topic, but the chain tension is still not perfect. I didn't actually take any more links off, and it was fine for a few days. But after changing the rear tyre I can't seem to get the chain as tight as before, even with the axle as far back as it'll go (maybe the chain just stretched a bit as it was new out of the box?). However, on my SRAM chain I can't take just one link out, it has to be two because otherwise the two ends won't fit together with the fastener link things. Could I get away with two do you think?

you can buy a half link at hubjub.co.uk