Hi all~ 
I have plan to make new SPS tank. (90cm x 90 x 50 LxWxH)
1. Is it good choice if I use Red Dragon Pump 4.5 m3 for return?
I heard It is very effective (no noise,less electricity,very powerful)
and I am not thinking Closed Loop( I have 3 tunze 6100)
In my current tank, I use Iwaki 20RX (about 540gph)
I will connect chiller and my Ca reactor to RD
EX
sump->RD->chiller->outlet (to main tank)
sump->RD->Ca reactor
Less electricity is very important factor in my country..
2. 1 is OK, How big is the hole in overflow needed? 1 inch is too small?
I am considering Dorso type.
Thanks in advance~

I have plan to make new SPS tank. (90cm x 90 x 50 LxWxH)
1. Is it good choice if I use Red Dragon Pump 4.5 m3 for return?
I heard It is very effective (no noise,less electricity,very powerful)
and I am not thinking Closed Loop( I have 3 tunze 6100)
In my current tank, I use Iwaki 20RX (about 540gph)
I will connect chiller and my Ca reactor to RD
EX

sump->RD->Ca reactor
Less electricity is very important factor in my country..
2. 1 is OK, How big is the hole in overflow needed? 1 inch is too small?
I am considering Dorso type.
Thanks in advance~

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