Flow is an important element for keeping corals. I have the Neptune PMK for determining PAR at a specific location, yet I am unsure of how to determine the same for flow. Is everyone just winging it and hoping for the best, or is there some secret tool or method besides watching the coral, to determine the flow. Also, if there is no way to measure it (FMK does not do this), what medium flow is to one person, that might be high or low flow to someone else, no? I’m a data person who likes to know precisely what I am doing (IT career), so I do not like guessing at things. Maybe the hobby (or parts of it) still involves guesswork like it did when I was last in it (12-15 years ago and not nearly as in-depth as I am now).