Sg Levels?

BigClownFace

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How do you go about lowering (if possible)/maintaining the sg level in a saltwater aquarium?
And what's the purpose of a canister filter? Is it an absolute necessity?
 
Isn't the specific gravity just a measure of the salt content? So to change the sg, either add salt or add water. :)

There was some debate about biological (canister or wet/dry) filters back when I had a marine tank, but people who keep corals often consider them useless nitrate factories, preferring to rely on the skimmer and live rock for filtration. I think the marine subforum might be a better place for up-to-date expert opinions on this.
 
As noted above, put in water with more salt to increase the SG and with less salt to decrease the SG.

Cannsiters can certainly be used. Some people just keep carbon or chemical media or live rock rubble in the cannister.

Many people consider cannisters to be a nitrate factory but this is only because they don't cclean them out to stop debris building up. The nitrates will only come from ammonia and as such if another form of filtration is resulting in less nitrates purely because the cannister is there then tiw ould lead to ammonia or nitrite not being processed as quickly, and both of these are far worse for livestock than nitrates.
 

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