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This is a discussion on The Overstock Project within the Freshwater Journals forums, part of the Aquarium Photography category; --> Carbon won't leach anything back into the water. It requires some VERY specialized circumstances to get carbon to release what it's adsorbed that will ...

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The Overstock Project
Old 03-07-2014, 10:11 AM   #31
 
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The Overstock Project

Carbon won't leach anything back into the water. It requires some VERY specialized circumstances to get carbon to release what it's adsorbed that will NEVER occur in an aquarium. I think it's like 800 degrees in an oxygen free environment. Once the adsorptive capacity is used up it just becomes biomedia.

That all being said, you should ditch the cartridges as they are not the best medias.
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Old 03-07-2014, 10:15 AM   #32
 
Can I switch the cartridges with poly-fill that isn't in sheets or does it have to be in sheet form?
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Old 03-07-2014, 10:20 AM   #33
 
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I like aquaclear sponges. That's all I would put in the HOB, if you are insistent on running it
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Old 03-07-2014, 10:28 AM   #34
 
I just figure the more bio media the better. I'm going to do some window shopping online.
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Old 03-07-2014, 10:32 AM   #35
 
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Everything you put in the filter is biomedia
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Old 03-07-2014, 10:36 AM   #36
 
Yes, but some are better than others, that's why certain filter media is considered mechanical and the likes. I always aim for high bio low mechanical. Mechanical should be taken care of for the most part with WCs IMO.
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Old 03-07-2014, 10:40 AM   #37
 
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If I were you I would fill the tom rapids with biomedia such as biomax or matrix and put sponge in the HOB. Will make cleaning the mechanical media significantly easier than having to break down the canister.
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Old 03-07-2014, 10:53 AM   #38
 
Alright, I'll probably do that. How well does the plastic filter sponge hold BB? Probably not awesome or HOBs would have better ratings, haha.
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Old 03-07-2014, 11:06 AM   #39
 
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The problem with HOBs is the minimal amount of media they hold.

There are 2 main variables that work together to determine the strength of the bacteria colony. Variable 1 is real estate - gotta have enough surface area for the bacteria to colonize. Variable 2 is turnover rate - the faster the water is turned over the lower the ammonia concentration entering the filter. HoB filtered tanks need a higher turnover rate than canisters because they don't house much media. You will often see 10x turnover suggested for HOBs, and 5x for canisters, and that is why. My overstocked tanks were always heavily filtered - close to 10x from canisters.
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Old 03-07-2014, 11:19 AM   #40
 
The canister alone will be 8x turnover. I was aiming for 10x but it just doesn't seem feasible in this tank. Even though the HOB won't do much, I feel better having the extra filtration.
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