High Nitrates - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 22 Old 03-25-2007, 09:56 AM Thread Starter
R D
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High Nitrates

Good morning all,I am a regular on a blue crab discussion site but feel like I am intruding here but I need a little help if possible. I have a closed system soft shell blue crab shedding operation in Fla. with 4600 gal. capacity than has been running for 2 yrs continuously,oyster shell substrate,mechcanical filter,16 3.5 by 8 ft tanks. My problem is Nitrates. Bio filter is working great,Ammonia is less than 0.5 ppm,Nitrite is less than 0.5 ppm,Nitrates are greater than 150 ppm,I didn't dilute the 2nd time to see how much greater.I bring my water in from the Ocean in 55 gal drums so it is a large chore to change most of it but that is the way in past years I have dealt with it. What I was wanting to know if there is a product i can buy in bulk to treat this problem. The water is tinted just a little yellow right now and this always seems to happen on weekends when the boat ramps are full making it very difficult to dally around with 300 gals of water on a 24 ft boat
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post #2 of 22 Old 03-25-2007, 11:21 AM
you running a skimmer? Dont take water from the ocean, its full of nasties.
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post #3 of 22 Old 03-25-2007, 11:28 AM Thread Starter
R D
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No protein skimmer yet,I am looking at building one,I live about 20 miles south of Tallahassee in a relatively undeveloped part of Fla. The water quality here if pretty good and I try to get water from whatever area my peeler crabs are coming from
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post #4 of 22 Old 03-25-2007, 11:30 AM
dont build one, to complicated and DIY ones are useless, buy a good quality venturi skimmer. For a tank of that size you would probably need more than one. Buy an RO unit and some high quality salt mix that clearly says NO NITRATES and NO PHOSPHATES. Its the best thing to do.
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post #5 of 22 Old 03-25-2007, 11:40 AM Thread Starter
R D
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RO unit?? The main problem with making my own salt water is cost,I am running around 16 ppt and that takes a lot of salt mix along with declorinating tap water.
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post #6 of 22 Old 03-25-2007, 11:42 AM
RO unit is a unit that makes RO water, you shouldnt mix tap water with salt mix as tap water can have nitrates, phosphates, copper etc. Get an RO unit that runs about 75 gpd, buy lots of salt mix and work the magic, cant afford it, shouldnt have started the hobby.

If you really want sea water, take the water from 20 miles out coast, there shouldnt be much pollutants there, an even better solution is to fly to one of the earths reef systems like the great barrier reef and take water from there.
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post #7 of 22 Old 03-25-2007, 11:53 AM Thread Starter
R D
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It's not a hobby,I have 7 or 800 crabs in the tanks right now and in a week to 10 days it will be 2500 too 3000 I hope. The saltwater I start with tests very well,(low Nitrates) it is a problem with build up after the bio conversion takes place, just looking for a way to reduce them without plants or alge
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post #8 of 22 Old 03-25-2007, 12:24 PM
and i gave you a way to do it, water changes with RO water and synthetic salt mix and adding many protein skimmers. Define low nitrates, a low nitrate level of new water that is to be added to the tank is 0
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post #9 of 22 Old 03-25-2007, 02:45 PM
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it could be where you are getting your water in the ocean, even though i realize ocean water is tuff, but if you need to do it this way, i would deff. start by testing the water in the drum before adding and see the exact quality of that water. How is the salinity. do you use fresh water for topoff. What quality is the top off water. Another thing is you need a protein skimmer no questions asked.
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post #10 of 22 Old 03-25-2007, 03:48 PM Thread Starter
R D
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My Nitrate scale only goes down to 0.5 ppm and the new water I bring in is well below that,new water is not the problem and making new salt water at 75 gpd will take me 61 days to fill up again, What I asked about was if it was possible to get rid of high Nitrates in the water I have already in excess of 150 ppm with a additive of some kind
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