Steve,
You are running an SPS only tank right?
I wonder if what you are running now would be too much current for softies or some of the LPS corals out there... :confused: Thoughts..??

So your saying you have 5000 gph worth of powerheads in your 90 and no hard current anywhere?

That might be fine in your glass bottom set up, but what if you put some substrate in there?

Sorry, but I have a hard time beliving that turning over the amount of just about the whole contents of the tank every minute does not produce a hard current.

im sure if you had a decend sized bed you would have a huge cloud. im running 20lbs of sand in my 90 and mostly going to have softies and lps.

nope I am saying I have 6800gph flow in a 90 and just a gentle current through out the tank. I had almost the same flow in my 90 when the sad was in there but it was concentrated in the top 1/2 and then did make some massive flow that still wasn't to bad. I would not go back to a sand bed if you paid me now.

Steve

1500's in a 4 foot tank of SPS is fine, but maybe too much for Softies. 1100's would be more ideal for softies. I have both of these models in my odd-shape tank I like it alot better then the 820's. 1100's are not much bigger then the 820's. The 1500's are noticably larger and heavier. Both new models run as quiet as the 820's. On start-up the new models are alot louder, this is an issue to consider when using on timer. Overall function and appearance of the new models are identical to the previous models.

Here's the pic of the SEIO 820 with the flow director housing off of it for you willo. :smile:

http://www.canreef.com/photopost/data/500/1376SEIO1.jpg

i run 2 620 and 2 maxi1200 my 620 are kinda noisy and i have to say doesnt seem like they push much more then my maxijets

you mean a 3 foot tank :mrgreen: but honestly with a 70X turnover rate there is nothing more than a gentle current. you watch some corals and the polyps are barley moving, the mushrooms are out and full. this is why I am thinking of replacing the two 820's with either tunze 1680's or the 1500's If I swap them with the tunze that will give me a 90X flow rate and if I leave them in with two new tunze it will be about a 110X flow rate.

I think right now I would not have a problem with any LPS or softies with the 70X turnover rate.

Now if I still had a sand bed I would not have been able to get it this gentle as it would be keeping sand suspended 24/7 so if you have a sand bed maybe stick with the 820's in the top 1/2 of the tank

Steve

So what would everybody recommend for a 4' 120 gal? 2 x 820 and a couple of mj 1200 on a wave maker? or something different?

:cool: thanks

how tall is the tank and what kinda of sand are you using?

Steve