Sorry I could not post before. You are correct viz is always better at high tide. On that day high tide was late in the afternoon so I timed the low tide for calmer waters. I ended up snorkeling the site and it was nice, average depths were about 8-10 feet. The artificial reef structures were full of fish, sergeant majors, grunts, ocean tangs, damsel fish, blennies- the usual florida sightings.