Since tides run on 28 day cycles, any two week period you choose will include a spring tide (full or new moon… tides are higher) and a neap tide (the waxing/waning a.k.a. half moon periods… tides are lower).
So, in any two week period, you will have some good fishing as long as the weather cooperates. Having grown up fishing Abaco, I can tell you January can be up and down depending on water temps and wind. It is winter, even in the Bahamas!
I would fish both sides of the lows in any case (spring or neap). Optimum time periods are 1/10-18 and 1/24-31. These are neap tides with morning lows. Neap tides mean less water, less water means it's easier to find fish and the fish aren't in the mangroves (may not be relevant in your case). Morning lows means the lows will be 50-55 minutes later each day so you can plan to fish both sides of the lows during those periods. Fish where they come out on the falling tide and where they go in on the rising tide.
Bottom line is I would snorkel around the 5th (morning high on a spring tide... full moon Jan 5) and the 20th (morning high on a spring... tide new moon Jan 20) and fish hard around the 12th and the 26th.
Scott
...and Lisa's very kind e-mailed comment:
Hi Scott,
Wow, thank you so much for your insightful information! I really appreciate your help. I appreciate your guidance.
Lisa