Trouble with fermentation?

I put my first batch of cider in primary on 2/26. The recipe was as follows:

2.5 gallons apple juice
1# light brown sugar
4 oz. lactose
1 packet Nottingham ale yeast

It started fermenting right away and was going steadily for several days before it began to trickle to about 1 bubble every 20-30 seconds. Now I have no activity in my air lock. Should I be concerned? I'm using an ale bucket for my fermenter and the temp was consistently around 68 and 70.

Any suggestions?

Thanks

Sounds fine. Leave it alone for a few weeks before racking. Cider can take a while to melow out, so plan on leaving it in the secondary for months.

If you used an ale yeast its probably don fermenting, or at least close ot it. I'd put into a secondary and let it sit for a few weeks.

I'd check the gravity, but it's probably done fermenting.