What are the positions of the Earth, Moon, and Sun at a time when there is the least difference between high and low tides? Does this happen when there is a full moon?
'Neap' tides when there is the least difference between high and low tide, generally occur around the time of the first and third quarter moons.
'Spring' tides when there is the largest difference between high and low tide, generally occur around the time of the New and Full moons.
The exact timing is complicated by your position on earth, the shape / size and depth of the ocean, coastlines also the moons distance from the earth and earths distance from the sun.