How much flow is enough?

[jnbrex]

I have a Red Sea Max Nano G2 XL with a display water volume of 29g. The return pump pushes about 400 gph and I have an AI Nero 3 set to reef crest varying between 75% and 100% flow, so between 1500 gph and 2000 gph.

Is this enough flow for an sps dominant tank, or should I consider adding another Nero 3?

 

[Acros]

For an sps dominant tank, you will need 2-4 AI Nero 3 or similar small pumps. It is tricky to give enough flow, without blasting the skin off some corals. I have an IM25 and currently have 3 powerheads in there. Soon, I will remove the biggest pump and add 2 small ones.

Edit: That being said, start with 1-2 pumps and add more as the frags grow.

 

[jnbrex]

For an sps dominant tank, you will need 2-4 AI Nero 3 or similar small pumps. It is tricky to give enough flow, without blasting the skin off some corals. I have an IM25 and currently have 3 powerheads in there. Soon, I will remove the biggest pump and add 2 small ones.

Edit: That being said, start with 1-2 pumps and add more as the frags grow.

4 Nero 3 in a 29g seems a little excessive, no? I could definitely see myself needing 2.

 

[Acros]

This is @happyhourhero ‘s IM25. He had 4 small powerheads in it. I will try to upload some pics of mine.

Post in thread 'HHH’s attempt at an IM 25 Lagoon'
https://www.reef2reef.com/threads/hhh’s-attempt-at-an-im-25-lagoon.808387/post-11018681

 

[Waters]

I personally would add one more....you should be able to get enough random movement between two pumps and your return in a 29. I have 4 in my SPS dominate 105g and none of them run higher than 50%.

 

[TheNative192]

Anyone know if I have two Nero 3 Pumps in the 25 Gallon lagoon what amount of GPH or % will be sufficient for two Acro frags? Also should I have them be pointed at each other away from the Acro frags or towards the Acro frags?

 

[ndrwater]

Anyone know if I have two Nero 3 Pumps in the 25 Gallon lagoon what amount of GPH or % will be sufficient for two Acro frags? Also should I have them be pointed at each other away from the Acro frags or towards the Acro frags?

You are looking for indirect but relatively high flow. This means NOT aiming powerheads directly at your corals. Think above their heads... If they had heads...
Flow is one of those things that you will honestly have to play with for the best results in your tank.
Polyp extension is a good indicator of a happy coral