Hi Tong.
Where are you diving around Plymouth?
Because of the nature of out coastline, I don't think that it matters too much if the tide is in or out. I've shot some of my best fish on a dead low.
Generaly, a rising tide will fish best on most sites, though it really comes down to getting in the water at a variety of locations and states of tide and seeing what works best. There are a few Plymouth spearos on the forum who dive locally, so lots of info to tap into.
Chris
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