high nitrates and large % water change

salt210

Active Member
I did do the change this morning, but it was a 50%. I only ended up changing about 80-85g out. now is the time where I leave it be and see.....
 

natclanwy

Active Member
I can't remember what size sump you have but I am guessing you have a total volume somewhere around 250g so an 80g water change would be 38% water change which would reduce your nitrate reading by 38%. So a nitrate level of 30ppm would be lowered to 19ppm.
 

taznut

Active Member
kinda a random question but, who do you do a 50% WC, if i tried that half of my rock and corals would be out of the water... i assume this is not good???
 

natclanwy

Active Member
Originally Posted by taznut
http:///forum/post/3057793
kinda a random question but, who do you do a 50% WC, if i tried that half of my rock and corals would be out of the water... i assume this is not good???
The only organisms that I can think of off the top of my head that would be negatively impacted by being out of the water is a sponge and some types of gorgonians.
 

salt210

Active Member
None of my rock was out of the water. the way it is stacked it does go above the halfway point in the tank.
my reading dropped to between 15-20ppm.
natclanwy- I believe that your guess on the total water volume is correct:
there is the 210g for the tank, the water in the remote sandbed(10-15g), then the 25-30g in the sump.
 

spiderwoman

Active Member
If you don't want to go with Vodka dosing and can't get your nitrates down, you might want to look into Sulfur Reactors. They will bring the nitrates down slowly, but surely. Quite a few of our FOWLR hobbiests are running those in large tanks.
 

spiderwoman

Active Member
Thanks for sharing. That was pretty amazing. Everybody always says not to expose Linckia's to air (or other star fish either) and sure enough those guys looked pretty alive and sitting under the baking sun.
 
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