Water flow

I have three Mag 350s on each of my 125s. They also have full RUGF plates driven by 6 Penguin 660 powerheads.

If you read the fine print in instruction manuals (most all) or on their websites, the stated gph is without any filter media or internals in place.:confused:
Like when was the last time we ran filters like that and what would it achieve?:wall:

I shoot for tank volume turnover of 6-10 times an hour, depending on the fish and how heavily planted. The powerheads are pushing a little over 1000 gals an hour back up thru the plates and substrate. If the mags are down to 50 gph with media in them, then that means the tank volume is going thru the floss and media, once an hour. The Marineland site has the 350 rated at 350 gph, by the way. I think the 100 you are talking about, is it's capability for up to a 100 gal tank.

No problems, just ask away. I would and we would rather answer the same question a hundred times, than to see someone take off in the wrong direction.:cool:
 
Yes the mag witch i have also is 350 gph suitable for up to a 100 gal. tank.2 canisters like the mags or something similar, along with your 400 would provide good filtration on your 120....:)
 
IMO 2 400's would not provide sufficient filtration, especially if you plan to heavily stock like you said, adding a canister with those would be better.I am planing on adding another canister to our 80 as soon as i can decide what to get.....:)
 
The 2 Emp 400 will probably be fine, provided reasonable stocking, conservative feeding, and staying with low waste producing fish. For example, if you had nothing but plecos and oscars, I would say you are lacking. But with standard angels and tetras, you would be okay, IMO.

One of the 125s has nothing but discus and assorted amazon community fish and the other is all mixed cichlids from africa. Both tanks have just low light plants.

If you are going heavily planted, IMO, the canisters are the better way to go to help control surface agitation and gas off of CO2.
 
I am not sold either way on bio wheels; but they do seem to be the recent trend. A poor man's wet/dry, so to speak. Which is another option you have for large tanks. A sump with overflow and wet/dry filtration.
 
Bio wheels provide additional biological filtration, heavily planted tanks usually do not need them, it wouldn't hurt to have them tho.....:)
 
We just sold our drilled 120 from our reef tank and had a sump underneath, and are looking for a nondrilled 120 for the fresh. I hadn't realized that there was so much with freshwater, we had the saltwater down pat...lol Thanks so much for your info.
 
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