too much flow??

[harris28]

I have a 75 gal with two MJ mods. My problem is I can not seem to position to where they don't kick up sand and make the water look cloudy from flying sand. Any ideas as to how to place them to where I get good non laminar flow but not kick up sand like crazy. I have tried them at the very top facing each other and it creates whirlwinds and stirs up sand. There has to be a better way??
And it seems like certain corals are getting blown around that don't need to be like my frogspawn. So for the time being I have just one on till I can figure something out.

 

[trippkid]

I run 3 of them in a 120, with no issues. I started with one of the DIY 2000 gph kind, and that did move some sand around, I just let it go and eventually everything(sand) found where it wanted to be without too much disruption or destruction to the tank inhabitants. I run two of them at the top, about 3" down, facing each other on opposite sides of the tank. The third one is right in the middle of the one side. As far as coral getting blown around, unless they looked stressed, I wouldn't worry and it may take a little while for them to get used to the increased flow in the tank.
Matt

 

[travis89]

It could be too much with both of them, which maxi jet are you using? 2 mj 900's will give you about 3200 gph. I'd say something like 1400-1600 would be good unless you have sps corals.

 

[harris28]

I have only one SPS and a few LPS and shrooms, zoos, clams. One is a modded 400 and one is a modded 900. Too much or just right??

 

[fatboyjoe]

I just got two mods for my 90gal. softy tank a week ago. I had the same problem you had.no matter what I did, sand all over the place and corals not looking too happy.even with just one mod on. so I'm back to powerheads again. I think there a good idea,but not for every tank. I woudn't put them in anything smaller than 125 gal. or if you have alot of softies or fine sand. I guess I'll use them for mixing my salt water in the basement. This was another case of "all the cool kids are using mods'', so I had too have them too. I went through this before with the close loop. that went out in the trash too. the "cool kids" didn't mention how noisey a c.l. is in your living room. what a piece of crap that was. I've learned alot from forums over the years but they have also cost me alot of money. I say If it ain't broke don't fix it. go back to the powerheads.

 

[big]

I have four NOT modified MJ 1200's PLUS a closed loop system putting an additional 1000 gallons per hour in my 72 bow....... All of my MJ's are in back corners behind live rock facing the rocks. That seems to lessen the "blasting" affects of their streams. But the mods may be a bit stronge with the kits, try maybe pointing them at your rocks???????..... Warren

 

[travis89]

You could try using the modded 400 and with the 900 unmodded and see if that worked without blowing the sand around.

 

[harris28]

yeah I tried that but the 900 likes to blow bubbles like crazy when un modded. I tried just the 400 modded but it created perfect laminar flow with I find undesirable and un healthy from what I gather to corals.