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Old 01-12-2009, 08:13 AM   #1
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Question Is This Normal??

My fishless cycle was complete. Ammonia and NitrItes were 0 and NitrAtes were between 5 and 0. 24 hours before I was going to buy fish, I replaced the carbon filter in my HOB filter and dosed some ammonia one more time. 12 hours later, I checked the ammonia level to be sure and it was STILL at 5 ppm. Checked again 12 hours later (24 hrs from dosing) and the ammonia level was about 1 ppm. Before I replaced the carbon filter, the ammonia level would drop from 5 to 0 in less than 12 hrs and now it's taken about 36 hrs. Granted, that's much faster than when I started the fishless cycle where it sat at 5ppm for weeks and weeks.

So my question is......is it normal to loose that much beneficial bacteria when you replace the carbon filter?? I'd hate for the ammonia level to stay that high for so long when there's fish in the tank.



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Old 01-12-2009, 11:10 AM   #2
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Yes that is normal. I think you sent your tank into a mini-cycle. Don't replace the filter unless you absolutely need to (ie to get rid of medication, the filter is falling apart). Rinse it in used tank water instead. I hardly ever have to change my filter in my hob.
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Old 01-12-2009, 01:56 PM   #3
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Yes that is normal. I think you sent your tank into a mini-cycle. Don't replace the filter unless you absolutely need to (ie to get rid of medication, the filter is falling apart). Rinse it in used tank water instead. I hardly ever have to change my filter in my hob.

Thanks Mr./Mrs. Produce......i'll leave the filter alone from now on.
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Old 01-12-2009, 04:07 PM   #4
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Also, considering ditching the AC (activated carbon), that is if your filter cartridge has a separate AC media cartridge. The only reason to use AC is to remove medications or remove any unwanted smells from the tank (fishy water smell). I've heard that if you leave AC in too long it will start leaching the stuff it filtered out, back into the water column. I've ditched the AC media in both my tanks for well over a year with no side effects.
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Old 01-12-2009, 04:36 PM   #5
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I havent used carbon in about a yr either, I packed mine full of scrubbies.
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Old 01-13-2009, 07:58 AM   #6
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I havent used carbon in about a yr either, I packed mine full of scrubbies.

Scrubbies!?!?!?.......what are those??
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Old 01-13-2009, 11:06 AM   #7
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I think he is talking about something like this. They are sold as pot scrubbers.

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Old 01-13-2009, 01:11 PM   #8
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Yes that is exactly the ones, LOL same color too. TY Verucaproduce
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Old 01-13-2009, 01:15 PM   #9
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Yes that is exactly the ones, LOL same color too. TY Verucaproduce

Should I remove the spy camera from your house? LOL
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Old 01-13-2009, 01:19 PM   #10
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You are too sneaky! LOL
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