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Can I use a freshwater filter with a saltwater tank?

triggerfish
R asked:

I have a eclipse tank, was used for freshwater. Can this filter hack it with a saltwater setup? the filters say ‘for system 12 or eclipse setups’. It’s a nice tank, like 20 gallons (it’s only for my triggerfish), and the filters say with black diamond carbon. Will these work, or how could I be able to tell if they will work?
EDIT: We already have a salt tank up, and most of the stuff for this new tank just laying around. But the trigger is sick or something and keeps getting picked on, so we figure he’s not going to last much longer. We thought he’d be happier in a tiny tank all to himself for a while, until he heals, or whatever. We just have the eclipse laying around as well and thought it would save us an expense.

HOWEVER: Is there a concensus? RIght now I am inclined to listen to biggourami as s/he seems to have the most knowledge and, more importantly, conviction.

5 Comments

  1. lonelymi says:

    it might filter out the salt and stuck in the filter, thus you need a sponge that has bigger air holes.

  2. skyvalker@sbcglobal.net says:

    As far as I know it should work just fine.

  3. BIGgourami says:

    most definately.. many people use eclipse tanks for pico saltwater tanks

    but a triggerfish is MUCH too big for a 20 gallon tank.. the smallest ones get to about 10”
    even filefish (basically small triggers) need 30 or more gallons

    you could still do a SW tank.. you just would be stuck with fish like damsels, gobies, clownfish, grammas, firefish, fairy wrasse, and inverts and such.. you could probably even do soft corals like mushrooms with the light on the eclipse lid..

    the salt is dissolved in the water.. a sponge isn’t going to filter out single molecules…

    $500 on rock for a 20 gallon?
    yeah right
    you could get 50 pounds of really good $10 per pound fock with that.. WAY over kill
    even though most rock is between 5-8 dollars a pound that’d just be even more rock…
    20 pounds of rock shouldn’t cost more than $200
    the whole setup would be about 500 but hes already got the tank light and filter.. where most of the money would go anyway

    brooklyn would you mind telling me exactly what a SW filter DOES? i mean if you’re talking from experience you must know right? oh, and please don’t dumb it down… i can take it…

  4. mwm0788 says:

    sure but a filter in saltwater has more of a mechanical
    purpose rather than fish support.

    that is the job of liverock and live sand as saltwater fish are 10 times more sensitive to ammonia than freshwater.

    congrats on making the jumo but be prepared to spend at least 500 bucks on rock, equipment and fish even for the most basic setups.

    just really research and plan this tank before actually doing anything….

    good luck!!!

  5. Brooklyn says:

    NONONONONONONONONONONONO!!!!!!!!!!!!!!!!!!!!!!! SALT WATER AND FRESH WATER FILTER ARE completly different from eachother. I would not do that salt water tanks have a special system to mix the salt at the proper amount. Fresh water tanks just filter in **** and un eaten food I wouldn’t try unless you attend to kill all your fish. Trust me from personal exsperince.

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