Maracyn 2 & The Nitrogen Cycle

Fishywife

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I've recently been using maracyn2 in a 10g quarantine as a preventative. This tank has been up a couple of months as I had 3 rescue kribensis in it recently. (Non medicated). I rehomed the pair and kept the 3rd wheel. Then I bought a pair of keyholes, which resided in there for about 3 weeks, one of which had hex. I used api general cure for that, which worked. Then my Angel's divorced as such and the female attacked my Male pretty bad, injuring his eye and pectoral fin. I had rescued a sailfin molly with tail rot too. So, I put the male angel in the 10g quarantine with the sailfin, dosed maracyn 2(after a huge water change) removed the keyhole to a 5g qt to finish his treatment.

So, my Male angel and female sailfin have completed thier 5 day treatment with maracyn2 and are healed, ready to go into my 55g. Which brings me to this:
I tested the 10g quarantine this morning for nitrates. It came back as 0. Puzzled, because the filter is fully cycled, and has been for over 2 years. So I ammonia and nitrite tested, which came back at 0 too. Perplexed is not the word. I do have a little bit of java moss and floating water Sprite in there, but imo not nearly enough to register 0 nitrates! Does maracyn 2 affect api nitrate tests? Has my cycle been knocked out? The angel and sailfin are big fish for a 10g so surely I would have gotten some type of reading from it?
Later on today I will be getting x3 large angels arriving (shipped) which will go into this 10g temporarily so obviously I'm a bit worried my cycle has gone bye bye. (I have plenty of cycled sponges in that case). Anyone else used maracyn 2 and got a 0 nitrate reading?
 

Whitewolf

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From what i know maracyn 2 is a cycle killer antibiotic. But its also a very good antibiotic So use with caution (remove your good bacteria filter pad and put it in a diffrent tank to keep running while you kill the bad bacteria in the display tank)

They do make flake meds, doxycycline and oxytetracycline work good too.
 
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Fishywife

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It's ok it's running in my qt tank. I always have small cycled power filters and sponge filters cycled at all times in case of emergency. I'll monitor the water closely as I have 3 large angels just delivered 2 of which needed meds.
 
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