I started a similar thread on a different forum, so I apologize if you've already seen this.

I struggled a lot starting out (and still do somewhat) on powerhead placement, matching flow with the corals I wanted, and selecting new corals for the flow that I have. You can find a lot of information that says a coral wants med-high flow for example, but there's very little out there that is definitive for what "medium" flow means. We talk about it in terms of tank turnovers, but that depends a lot on PH placement, the coral in relation to the PH, etc.

With the digital age, I thought it may be beneficial to show our PH placement and the resulting flow via video rather than answering in forums with, "I place power head XYZ in the top back facing this way." I know I personally learn better visually. In addition, this may be a great way for those new to the hobby to get a feel for the types of corals they want as they can see them in action in addition to still photos.

I'm curious in seeing what others do and hope others can post videos as well. DISCLAIMER: I'm by no means an expert. In fact, I haven't seen another reef tank in real life other than mine. This is just my visual definition of Low, Medium, and High flow based on what has worked for me so far.

@TanksEveryWhere ... Hope this helps with your PH placement and selection

I have a 150 gallon corner tank that has 2x 1600gph JBJ and 2x 500gph JBJ powerheads. I'm trying to maintain high flow in the back third of the tank for SPS corals, medium flow in the middle third for SPS/LPS, and low-medium flow in the front third for LPS/softies. I run my JBJ's through an Apex controller to create a random flow. The back right and front left JBJ go for 20 seconds (creates counter clockwise flow), then all four for 20 seconds, then the back left and front right for 20 seconds (creates clockwise flow), then all off for 20 seconds.

https://www.youtube.com/watch?v=_f4hmoxaU0s