Join Date: Jan 2010
Location: Lafayette, Louisiana
Generally most people on here refer to the part that's sucks up te water as the intake or inflows and the spray bars or parts that shoot out as the outflows.
As far as placement goes, you have to think of the end goal of why you are placing then where you are placing them. Our goal in planted tanks is to have "well circulated" tanks where there is a good bit of flow throughout the entire tank. This provides co2 and fertilizer enriched water to all the plants in the tank. This promotes the most robust plant growth and deters algae growth in the low flow spots.
This is not to say, however, that you aren't going to have higher flow rates where the spray bars actually point. I just wanted to point out our main objective.
I would recommend putting the inflows wherever your spray bars don't directly point. Meaning if you put one spray bar on the back and one on the right side pointing left, then I would definitely put an intake in the back right corner since it doesn't have any direct flow in that direction. Although the pull of the intake isn't as "powerful" in the sense that it pulls water from all directions, one mustn't rule out that the pull will still provide some flow. I would then probably put the second intake on the left corner.
Another thing to consider is making sure that being that you have your heater run on only one filter, make sure that you don't make two separate closed systems. Meaning- if your heater filter spray bar is on the right side point to the left, I would put that intake on the right back corner. That way the other filter will suck up the heated water from its intake in the back left corner and further disperse it. This probably doesn't matter all that that much but it definitely can only help. It's better to have one long path of flow sort of like a winding racetrack as opposed to two circular tracks. If this doesn't make sense ill try to explain it a little better.
Last edited by pianofish; 05-11-2013 at 10:53 PM.