Very strange deaths in RCS tank
Planted Tank Forums
Your Tanks Image Hosting *Tank Tracker * Plant Profiles Fish Profiles Planted Tank Guide Photo Gallery Articles

Go Back   The Planted Tank Forum > Specific Aspects of a Planted Tank > Shrimp & Other Invertebrates


Reply
 
Thread Tools Display Modes
Old 09-09-2013, 03:35 PM   #1
CT89
Algae Grower
 
PTrader: (2/100%)
Join Date: Jul 2013
Location: Cornfields, Central Illinois
Posts: 123
Default

Very strange deaths in RCS tank


Hello,

I've had about four shrimp deaths in the last two weeks, for no discernible reason. They all seem to be low grade shrimp and/or males. The higher-grade shrimp and shrimplets have all been A-Ok. I'm not unduly worried because of that fact.

Any idea why low-grade shrimp would kick it, but higher-grade individuals and shrimplets would be unfazed? The snails and otos int he tank haven't shown issues wither, and the shrimplets are growing really fast and putting on color (they're my first batch of shrimplets so I don't now where they should be at this age).

I don't dose any water buffer, hardener, etc. I (over)fertilize twice a week, but I don't use Excel in the tank. There is CO2 injection while the lights are on, and I haven't fed the tank in a few weeks due to a hair algae outbreak.

The only large changes I can think of are removing filter carbon in favor of more biomedia a couple weeks ago, as well as topping up with dechlorinated tap instead of RO water.
CT89 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 09-09-2013, 03:41 PM   #2
Soothing Shrimp
Planted Tank Guru
 
Soothing Shrimp's Avatar
 
PTrader: (131/100%)
Join Date: Nov 2011
Location: Illinois
Posts: 6,606
Default

I'm guessing that the deaths have only been a coincidence with the lower grades.

I'm also going to guess that your TDS has been creeping up if you've been using tap to top off.
__________________
RAOK Club and BBRR Club! My thinking has been invert-ed!
Soothing Shrimp is offline   Reply With Quote
Old 09-09-2013, 03:51 PM   #3
somewhatshocked
Obsessed? Maybe
 
somewhatshocked's Avatar
 
PTrader: (427/100%)
Join Date: Aug 2011
Location: Louisville, KY
Posts: 11,356
Default

Probably a combination of everything you listed.

Removing filter media = could have caused ammonia spike

Constant TDS creep

Ferts and CO2 if not properly acclimated

What are your actual parameters?

TDS
GH
KH
Temperature
Ammonia
Nitrite
Nitrate
somewhatshocked is offline   Reply With Quote
Old 09-09-2013, 03:59 PM   #4
CT89
Algae Grower
 
PTrader: (2/100%)
Join Date: Jul 2013
Location: Cornfields, Central Illinois
Posts: 123
Default

I normally top off with RO water. Dechlorinated tap is the exception to the norm. As for filter media, it's possible that removing carbon may have caused an ammonia spike but given that the shrimplets and higher-grades are fine, I think that's probably not the case.

A couple other factors might be temperature swings and hydra. I'd forgotten to mention that I discovered hydra in the tank last night. The tank itself is in a room without A/C, with a fan over it as an ad hoc cooling system.
CT89 is offline   Reply With Quote
Old 09-10-2013, 12:07 PM   #5
somewhatshocked
Obsessed? Maybe
 
somewhatshocked's Avatar
 
PTrader: (427/100%)
Join Date: Aug 2011
Location: Louisville, KY
Posts: 11,356
Default

What are your actual parameters?

TDS
GH
KH
Temperature
Ammonia
Nitrite
Nitrate
somewhatshocked is offline   Reply With Quote
Old 09-10-2013, 02:39 PM   #6
Dolfan
Planted Tank Obsessed
 
Dolfan's Avatar
 
PTrader: (2/100%)
Join Date: Apr 2005
Location: Birmingham, AL
Posts: 310
Default

Hydra could be the culprit. Here is a link to an article on planetinverts about how to treat hydra with dewormer meds.....

http://planetinverts.com/killing_pla...and_hydra.html
Dolfan is offline   Reply With Quote
Old 09-10-2013, 08:59 PM   #7
CT89
Algae Grower
 
PTrader: (2/100%)
Join Date: Jul 2013
Location: Cornfields, Central Illinois
Posts: 123
Default

Thanks. I'll look into that. I've read the article before, but am not sure where to find dewormer meds.

I saw several successful molts today, and the fan has helped regulate temperature. I haven't seen any more deaths for some days. I'm hoping it's hydra and/or temperature swings being the culprit.
CT89 is offline   Reply With Quote
Old 09-12-2013, 12:42 PM   #8
somewhatshocked
Obsessed? Maybe
 
somewhatshocked's Avatar
 
PTrader: (427/100%)
Join Date: Aug 2011
Location: Louisville, KY
Posts: 11,356
Default

Hate to rain on the parade but unless you know the parameters mentioned above, you won't likely find an answer to what's going on. It will just be a guessing game otherwise.
somewhatshocked is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 07:58 PM.


Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright Planted Tank LLC 2012