New spike turned brown, roots out of control!

[adamc]

Hi all, I bought my first phalaenopsis orchid in November 2015 in Sydney, NSW, Australia. At the time, it was in full bloom, but all of the petals fell off about 3 months later at the beginning of February. I've been watering it about once a week, and fertilising it every 2 weeks with Peter's Excel Orchid Fertiliser CalMag Finisher Organic-S 12-6-20+6.5CaO+2MgO+TE.

I was happy when I noticed another spike that was starting to grow from underneath one of the leaves in the beginning of February, but this spike has now turned brown, and looks like it's dying (you can see this in the pictures with the red circle). The roots have also now gotten out of control, and are growing quite wild.

So I have a few questions. Since the roots are growing out of control, and the orchid has lost it's bloom, does that mean I should repot it now?

Also, where should I cut the old spike? Should I cut it just under where it's turned brown, or should I cut it much further down the base? Why did the new spike turn brown and die, is it because the plant didn't have enough energy to keep it growing because the old spike was still left intact, which was taking energy away which the plant needed to grown the new spike?

I was pretty happy with the progress, until I noticed that the new spike was dying. I thought it was going to grow and eventually bloom, but it never quite made it more than a few centimetres before turning brown.

If anyone can give me some advice, I'd be very appreciative, since I'd love to see this plant bloom once again!