Tropical Fish Keeping - Aquarium fish care and resources

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bhone20 05-10-2008 09:41 PM

Nitrate Spikes
80 gallons
large gravel
76 degrees
fake plants
nitrite -o
nitrate -80 ppm
ph 7.3
filter--Fluval 405 with good carbon,carb/ammonia bags.Filter is cleaned/carbon replaced every 30 days.
Occupants--2 large Oscars

Just wondering what would be a good way to reduce the ppm of nitrate? I have done 25% water changes/gravel vac every other week.I then ad fresh water,then treat the water with conditioner that eliminates nitrite,nitrate,chlorine, chloramines . My tank is growing algae on the back glass and plants,and the nitrate level has me a little worried,but it does not seem to be getting worse than this around 80 ppm.

Should i use a tap water filter when replacing fresh water?.I have read that most tap water supplies have nitrate.

All of my testers (ph,nitrite,nitrate) are API 5 ml. tube&droppers
These pictures are of the back of my tank ONLY 1 week after cleaning the glass.
I log onto this forum 3 times a day,If there is any other info needed.

jeaninel 05-10-2008 11:54 PM

I would increase the water changes to every week at least 50% doing a good gravel vac each time. Oscars are messy fish.

Have you tried testing your tap water for nitrates?

bhone20 05-10-2008 11:57 PM

No,I have not.I will do that.

bhone20 05-11-2008 12:17 AM

Ok,I tested the tap water,and it shows 10 ppm of nitrates.

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