I had rearranged the rockwork and put the new pumps back into service on Wednesday afternoon, but just now got around to having the time to post about the outcome. The new pumps are alot quieter than the old ones.. not what I would call silent yet, but alot better (and I am witholding judgement until they have had a chance to break in and "find their groove", not to mention that the wet ends are recently rebuilt, so it isn't fair to judge the pumps on noise levels yet
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). In addition to moving the VTs around I lowered all 4 so that the tops of the wet ends were 6" below the waterline (before we had them 4" - 5" below and had alot of surface aggitation, now we just have lots of water movement, which we wanted
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).
I am overall very happy with how the flow has worked out. The fish seem to enjoy it but the livestock that has reacted the strongest is the RBTA pair. They appear to be fuller and out more than they were before.
We have the pumps set up in a gyre formation. Here is our current layout, with the Vortec pump placements. rockwork, returns, etc.
In can you are wondering about what it all stands for, I will explain the numbers next to the
V's that indocate the Vortecs and the arrows near the back middle of the tank and next to the RBTA island.
Right now we have it set up that pumps 1 & 3 (V1 and V3) are on while 2 & 4 (V2 and V4) are off (not really "off", but actually @ 10% to keep the fish out). Then it switches to 2 & 4 on while 1 & 3 are off. The duration is 99 seconds right now, but I am thinking about changing it to a longer or shorter duration, but haven't decided yet. Right now I am seeing flow in places I honestly didn't expect to. For example, the arrow at the top of hte picture, which indicates the valley between two large rocks at the middle rear of our tank; that indicates a significant flow area, in the direction of the arrow. I noticed on of the clowns hanging back there just swimming against the current (hanging about 2/3 the way back between the rocks, near the back glass, swimming towards the front of the tank), and not really going anywhere. It reminded me of a bird gliding on a head wind, but staying in place, neither moving forward or backward. There is also a good amount of flow across the RBTA island, regardless of which pair of pumps is running (gotta give ETM credit for the "undertow" they create).
The tank was cloudy from things being stirred up, both from the rocks I moved around and from the new flow patterns picking things up that weren't affected by the flow before. It took it a day to clear back up and is now pretty much crystal clear (but clear water does not == a healthy tank.. it is only part of the equation, and I am still working on/struggling with the other part of it now).
I wholly expected our skimmer to work overtime for a bit after the pumps were re-configured (since I am hoping that alot more particulate matter is getting picked up, suspended and carried out of the tank in the overflows), but to my surprise there wasn't much difference at all in it's output. It is still producing modest amounts of skimmate, but no more or less than before. I can't wait to get the new pump on the skimmer to see what she is capable of
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