Here's what happens:
After water change, nitrates are at 15.
One week later, before water change, nitrates are at 40 and discus can't handle them that high from what I've been led to believe. I don't test dutifully enough to find how quickly nitrates rise to 40, I just know that the system Ive put in place is working for the stock I have in place. Hopefully the pothos can keep them that way.
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My mother plant consumes roughly 25ppm nitrates per week. Mind you its been planted for a year. But after the first 3 weeks or so it was about 10ppm, bigger it gets the more it consumes. My messy 6 adult rbp in my 125gal only need a wc almost every 2 weeks and my n03 peaks at 20-25ppm, I have an open top so evaporation is prevalent therefore between wc I top off about 8gallons of h20 and my fish thrive!
Never doubt pothos power
×Go S Vettel #1 Infiniti Redbull! 3x WDC!!!×
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Cheap way to decrease nitrates and keep your fish healthy: http://monsterfishkeepers.com/forums/showthread.php?t=504763
You both raise challenging arguments with definite possibilities of moderate success. Unfortunately the OP's situation will require quite a bit more than moderate to successfully house Discus. For argument sake lets say you're gonna add 3 or 4 adults (more forgiving). 15 ppm after a water change w/ present stock is still on the high side for Discus. 75g is not gonna be enough water or space for this group of 10 or 11 to thrive. You couldn't dangle enough plants to make a significant difference in nitrates. Even with major W/C's you would be hard pressed to maintain a consistent 10 ppm. Other cichlids can fare well for a time in high nitrates (not long), Discus require more pristine surroundings to thrive. The more water or less fish, the slower the nitrate creep. Adding plants to an already under control situation could prove beneficial in further lowering the count but a closed environment is still gonna require the keepers hands on to maintain consistency.
