Old CRS tank not as vibrant as it once was - The Planted Tank Forum
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post #1 of 8 (permalink) Old 06-29-2016, 02:26 AM Thread Starter
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Old CRS tank not as vibrant as it once was

Hello all!

I have about a 3 year old 2.5 gallon CRS tank that has done very well, but lately I'm not getting the breading I used to, and the shrimp numbers have declined slightly.

It was setup with Aquasoil, and I think that it may be expired.

How would I go about replacing it? Any other tips to renew an old CRS tank?

Whiskey

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post #2 of 8 (permalink) Old 06-29-2016, 09:13 AM
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Do you have plants? are the water parameters and temps ok? Maybe its the inbreeding causing a problem...
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post #3 of 8 (permalink) Old 06-29-2016, 10:06 PM Thread Starter
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Do you have plants? are the water parameters and temps ok? Maybe its the inbreeding causing a problem...
I do have plants! The tank is quite lush, I don't use ferts or anything, just balanced light levels and low light plants.

The perams are okay. I do 2 coffee cups of water change per week, using RO/DI water that is reconstituted for CRS. There are shrimp that are alive and well, but not as many as there were.

Thank you,
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post #4 of 8 (permalink) Old 06-30-2016, 08:24 AM
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If everything is fine, I suspect you have not added any new shrimp recently. Maybe the population has declined because of too much inbreeding. Also the current shrimp might have aged and must be towards the end of their life cycle. Try throwing in some new shrimp and new varieties as well! You might spice it up a bit./
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post #5 of 8 (permalink) Old 07-02-2016, 03:09 AM Thread Starter
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Originally Posted by valthegreat View Post
If everything is fine, I suspect you have not added any new shrimp recently. Maybe the population has declined because of too much inbreeding. Also the current shrimp might have aged and must be towards the end of their life cycle. Try throwing in some new shrimp and new varieties as well! You might spice it up a bit./
Fair enough, but CRS have been bread from decades from an original 3 shrimp. Do you think that inbreeding can be a problem at this point?

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post #6 of 8 (permalink) Old 07-04-2016, 08:39 AM
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genes are similar...and only one way to know ;-)
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post #7 of 8 (permalink) Old 07-11-2016, 11:51 AM
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I suspect there may be a problem with your tank temps. I keep my tanks at room temperature and they get in the upper 70s, a bit warm for CRS. I loose some of my adults every summer but a few of the shrimplets survive each year and they rebound in the fall. Seeing that you live in CA you may have the same problem. Shrimp only live 1 to 1.5 years.

20g L46/hastatus/pygmy corys, 10g OEBTs, 10g blue bees/blue velvet shrimp, 10g CRS, 25g L174s/BNs/L340s, 10g yellow/red tiger shrimp, 15g clown plecos/CPDs/habrosus corys, 15g cory fry, 29g Weitzmani/panda corys/BNs, 46g L134s/salt and pepper corys/BNs/rubberlip pleco, 55g SAE/L201s/L199s/BNs/kissing gourami, 75g L316s/BNs/L134s/CAE/silver dollar, 30g L340s/L211s/CPDs,10g tangerine tiger/snowball shrimp, 20g L134/habrosus corys, 10g CPD fry
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post #8 of 8 (permalink) Old 07-22-2016, 01:38 AM Thread Starter
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I suspect there may be a problem with your tank temps. I keep my tanks at room temperature and they get in the upper 70s, a bit warm for CRS. I loose some of my adults every summer but a few of the shrimplets survive each year and they rebound in the fall. Seeing that you live in CA you may have the same problem. Shrimp only live 1 to 1.5 years.
I have a controller running fans maintaining temp on this tank, plus it's in an air conditioned office. Temp is kept between 74.0 and 74.2 (fans on and off) it can drop to 73.5 before the heater comes on. Great thought though!

Has anyone replaced the Ammano substrate in a running tank like this before? I really think that's the issue, PH has been drifting higher and I think it's just because after the years the substrate has lost it's buffering ability.

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