Advice needed please

[Big John]

I have had my tank running for 9 months with no problems but my nitrate has suddenly gone through the roof the tank is a 55g with 15 fish in. 3 of them are around 6 inch the rest are 3 inch or smaller. I normally do a 40% water change a week and have no problem. What should I do? Is it just a case of do lots of smaller water changes or can I be doing something else to help. Fyi I have 2 external filters running at 2000 lph and have not added any fish for around 4 months

Sent from my HTC One using Aquarium Advice mobile app

 

[twiddlemuffin]

Have you slacked on changes ? I'd do daily water changes until the number gets under control.

 

[Big John]

No not at all but I will do a daily one until it's under control

Sent from my HTC One using Aquarium Advice mobile app

 

[NYgiantsRP]

Did you replace the filter media? Rinse media in tap water? Did you do any major rearranging of decor? Forget water conditioner?

 

[Kirrie]

Old tank syndrome maybe? This link offers an explanation for why you might be seeing high nitrates, and how to solve the problem/prevent it from happening again.

http://www.myaquariumclub.com/old-tank-syndrome-4144.html

 

[Big John]

Did you replace the filter media? Rinse media in tap water? Did you do any major rearranging of decor? Forget water conditioner?

Non of the above

Sent from my HTC One using Aquarium Advice mobile app