nitrate out of wack

[sidd129]

I have a 75 gal. Its been up for about 7-8 months. I have 120lbs ish of lr. actually its not all live rock yet. Some of it only has a little purple on it. I have a 4" dsb and several fish. I have mushrooms, zoos, a leather, palys, and a bta. My amonia is 0, my nitrite is 0, and my ph is 8.2. my nitrate spiked last week and I can't get it below 20. when it first went up it was above 40. I'v been doing a 10 gal water change every other day. I have macro algea in the tank. What could cause my nitrate to spike like this???

Thankyou,

Adam

 

[BurntOutReefer]

dead fish?

 

[sidd129]

All present and acounted for. How long can my corals put up with this if I can't get it down?

 

[BurntOutReefer]

IMO...20 is really not too bad....keep doing water changes though...need to get it down....anything disturb your DSB? as that can /might cause nitrate to go up suddenly....whats your filtration?

 

[sidd129]

About a week or two ago I had a maxi jet fall off the wall. Instant snow storm. It blew pretty deep. I have the cpr bak pak.

 

[BurntOutReefer]

thats most likley the reason. Keep doing water changes...should go down

 

[sidd129]

More water it is. Scence the begining it still sounds funny when I say that I have to water my fish.

 

[Holmie_D_Klown]

I agree with BurntOutReefer, must have disturbed the deeper DSB layer. Don't do anything drastic, 20 is not really dangerous to your tank. I guess the prudent thing to do would be a few water changes to get it down. Personally, I would just leave it be and let your DSB and regular water changes get it down over the span of a month or two.