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I'm by no means an expert, but from what I've read (and experienced) tanks with a pH of less than neutral cycle much more slowly than those above neutral. I'll see if I can find a link to some more detail.

Once your cycle has finished, you shouldn't have the pH dropping problem; it's the addition of the ammonia that causes this. If you can, also check your KH. I'm certain that this will show as zero. So, do a water change (enough to raise your pH again), and add some baking soda to raise your KH...

I had a similar thing happen during my cycle. When I realised that my ammonia wasn't being used up entirely, I checked my pH, and found that it had dropped from a usually stable 7.2 to 6. This drop seems to be enough to stall, or at least slow down the cycle. I also checked my KH (carbonate...