Help with Nitrates!

JurisHP · 11/09/2021, 08:39 AM

Over the past 2 weeks, I have lost most of my fish. Gem Tang, Purple Tang, 2 Yellow Tangs, Sohal Tang, Tomato Clown, Wrasse, Powder Blue Tang and a Hippo Tang. When this first started happening, I thought it was Ice, but the fish didn't look like they had been infected with that. Their skin was kind of peeling off, and they looked "cloudy" if that makes sense. I tested my parameters, and was shocked to find that my Nitrates were off the charts high. I started doing major water changes....30 gallons/day for days...that seemed to have stopped (well, slowed) the deaths, but I am still losing fish...I am down to 2 fish left. I tested my Nitrate again today, and it is reading 75...maybe my tester (Hanna's new testing device), doesn't read above 75, so it may be even higher than that! I can't imagine why my Nitrates are so high and won't come down.l I use RO/DI water exclusively, dose NoPox (well, just started that a few days ago)....I had a MarinePure block in my sump which I removed...I just don't get it.

One wild card....I took my Ca Rx offline for 2 weeks, as my Ca/Alk was out of balance. Once I got it in balance, I fired it up again...but the water in the reactor was sitting there not being circulated for that 2 weeks....I didn't refill with new water before firing it back up. Just thought I'd mention this.

Any thoughts? I am of course devastated at the loss of life, but will keep on keeping on...I of course won't add any new fish until I solve this very perplexing issue.

Any help is GREATLY appreciated.

Thanks!

Vinny Kreyling · 11/09/2021, 11:39 AM

2 weeks of stagnant water could be the cause. Did you notice any foul smell after restarting the CA reactor?
Doubtful nitrates are the cause. When I had my old tank nitrates were about 150 with fish only.

Sk8r · 11/17/2021, 12:36 PM

No rotten egg smell? (Hydrogen cyanide, often from black stuff in stagnant area.)

11/09/2021, 08:39 AM	#1
JurisHP Registered Member Join Date: Sep 2008 Location: Philadelphia, PA Posts: 168	Help with Nitrates! Over the past 2 weeks, I have lost most of my fish. Gem Tang, Purple Tang, 2 Yellow Tangs, Sohal Tang, Tomato Clown, Wrasse, Powder Blue Tang and a Hippo Tang. When this first started happening, I thought it was Ice, but the fish didn't look like they had been infected with that. Their skin was kind of peeling off, and they looked "cloudy" if that makes sense. I tested my parameters, and was shocked to find that my Nitrates were off the charts high. I started doing major water changes....30 gallons/day for days...that seemed to have stopped (well, slowed) the deaths, but I am still losing fish...I am down to 2 fish left. I tested my Nitrate again today, and it is reading 75...maybe my tester (Hanna's new testing device), doesn't read above 75, so it may be even higher than that! I can't imagine why my Nitrates are so high and won't come down.l I use RO/DI water exclusively, dose NoPox (well, just started that a few days ago)....I had a MarinePure block in my sump which I removed...I just don't get it. One wild card....I took my Ca Rx offline for 2 weeks, as my Ca/Alk was out of balance. Once I got it in balance, I fired it up again...but the water in the reactor was sitting there not being circulated for that 2 weeks....I didn't refill with new water before firing it back up. Just thought I'd mention this. Any thoughts? I am of course devastated at the loss of life, but will keep on keeping on...I of course won't add any new fish until I solve this very perplexing issue. Any help is GREATLY appreciated. Thanks!

11/09/2021, 11:39 AM	#2
Vinny Kreyling Registered Member Join Date: Nov 2002 Location: Miller Place, NY Posts: 7,206	2 weeks of stagnant water could be the cause. Did you notice any foul smell after restarting the CA reactor? Doubtful nitrates are the cause. When I had my old tank nitrates were about 150 with fish only. __________________ 250 gallon mixed reef, 2 Reefbreeder's Photon V 2, Deepwater BLDC 12, DAS EX-3 Skimmer, MTC mini cal, 2-3/4" Sea Swirls, Aquacontroller & 6 Tunze pumps.

11/17/2021, 12:36 PM	#3
Sk8r RC Mod Join Date: Feb 2006 Location: Spokane WA Posts: 34,628 Blog Entries: 55	No rotten egg smell? (Hydrogen cyanide, often from black stuff in stagnant area.) __________________ Sk8r Salinity 1.024-6; alkalinity 8.3-9.3 on KH scale; calcium 420; magnesium 1300, temp 78-80, nitrate .2. Ammonia 0. No filters: lps tank. Alk and cal won't rise if mg is low. Current Tank Info: 105g AquaVim wedge, yellow tang, sailfin blenny,royal gramma, ocellaris clown pair, yellow watchman, 100 microceriths, 25 tiny hermits, a 4" conch, 1" nassarius, recovering from 2 year hiatus with daily water change of 10%.