375 FOWLR closed loop design questions

jjk_reef00

New member
I just picked up a used acrylic 375 (8'x30"x30"). It is drilled for closed loop on the bottom, and has 2 little giant pumps. I want recommendations for how to set it up and for a pump that isn't going to act like a heater.

Here is a sketch of the setup looking from the top to the bottom.
Bulkheads 1-4 are 1" and a-b are both 3/4".
I'm putting a glass holes overflow on side with the +++.
It will have 2 returns from the sump comming in at about 4.
It will be 3-side viewable room divider which is why the overflow and returns are on the same side (although I could move one of the returns to about 2 if needed). I think with the closed loop I won't need to extend the return.

I also plan on having 1 or 2 Tunze 6305's on the same side as the overflow.

------------------------------------------------------------------
| ...........................................................................a...|
| ................................................................................|+|
| ................................................................................|+|
| ...........1.................2.................3.................4........ .|+|
| ................................................................................|+|
| ..b............................................................................|
-------------------------------------------------------------------

I was going to use either 2,3 or 3,4 as intakes using these: http://www.aquabuys.com/p/OV10010.html

The other 4 would be returns for the closed loop.

I ws thinking about using a waterblaster pump but I'm not sure what size I should go with? The larger models have 1.25" intake so I was going to use a large pump and send 2 of the 1" bulkhead inakes into a single 1.25" pump intake. Then have the pump drive 4 of the outputs. I have the optoin of plugging a,b and have only 2 closed loop returns.

So 3 questions:
1.) Should I use 2,3 or 3,4 as intakes?
2.) Shoud I use a single large pump fed by 2 intake or get 2xsmaller pumps? (And which pump should I use WaterBlaser xxxx, or other pump)
3.) 2 or 4 closed loop returns (should I plug a,b)?

If you have a better way of setting this up I would love to hear.
At this time I don't want to drill the tank anymore than what it is (but I will consider it if people feel it is the best thing). I'm not really worried about redundancy with 2 pumps since I will be using 2 Eheim 1262 return pumps from my sump and I will have the Tunze(s).
 
Here is my flow plan so far.
I'm trying to get a circular motion going if possible so I'm going to point the loc line up to point towards the middle of the tank. At this point I think I'm going to try 1 large pump and just feed the 2 x 1" bulkhead intake into the input of the waterblaster pump. I still don't know which pump I should use.

Each 'V' below indicates the direction of the flow from each source.
----------------------------------------------------------------------
| ............>>...............................>>........................a....|
| ...........^.................................^............................v....|+|
| ...........^.................................^............................V....|+|
| ..^.......1..............IN2...............3...............IN4..............|+|
| ..^..........................................v...................................|+|
| ..b....................................< < v..........< < < Ret / Tunze |
|----------------------------------------------------------------------|
 
Last edited:
Bump, any thoughts?
Do you guys think it is better to try to get a circular pattern going or should I have the returns sprey in random directions?
 
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