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Old 02-19-2018, 01:28 AM   #1
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RCS

So I have a 10 gallon RCS breeder tank that's been cycled for a while (I used established media to cycle it and I test weekly) and it had maybe 17~ I bought. I'm now down to 5 or 6, no detectable ammonia or nitrite and nitrate is maybe 5 and the temp is 78į. The tank has big moss balls and hornwort along with driftwood and I feed sparingly when I do using sinking pellets that get removed. However the pH here is about 8, both API tests and city reports have it between 7.8-8.2. I haven't seen any signs of breeding and they just seem to die. Any ideas on why they keep dying? I get them from across the street so same water and a place about 40 mins away and acclimate them. Thanks!
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Old 02-19-2018, 09:25 AM   #2
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I lost all of my shrimp when I changed my substrate. I had problems with Black Diamond Sand so I changed to Tahitian Moon Sand. Not just shrimp died. Snails died too. Heavy metals in the substrate. Take a rare earth magnet and see if your substrate moves.

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Old 03-02-2018, 12:25 AM   #3
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Mine slowly disappeared when I let the substrate get too dirty. I never tested positive for ammonia/nitrite or had too high of nitrates but they still slowly died off over time and I never came up with a better explanation then that the dirty substrate was making them susceptible to something ...Since I started cleaning the substrate in sections again theyíre doing better.

I also think they seem to have a breeding season. Even when they have a light and heater they somehow seem to know when itís the dead of winter and just donít breed as much.

The other possibility is that if youíre buying them fully grown from the store theyíre already relatively old for shrimp. They just donít have much breeding/life left in them? When I bought some from a local fish store fullly grown they had a couple of batches of babies and then died off but the babies did well.
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Old 03-02-2018, 09:27 AM   #4
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I had over 70 shrimp of all ages. I had started with 10 5 months prior. My tank was stable with 0 Ammonia and Nitrites and 20-40 Nitrates. And then the snails died. I started doing daily observations and found the symptoms they exhibited as heavy metal poisoning. Since I removed the Tahitian Moon Sand I havenít lost any live stock. I just added shrimp back this week and they seem to be doing ok.
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Old 03-02-2018, 11:05 AM   #5
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Heavy metals will do that. My substrate didnít have any so that never explained my problem. I think the point is, it could be a lot of things. Like tmaierís experience if your gravel or sand has any heavy metals or if any of your ornaments do that could cause a problem. Itís really hard to tell with shrimp. Red cherry shrimp can be very hardy as shrimp go but they are sensitive to a lot of things too.

Do you use prime in your water? Prime detoxifies heavy metals. Maybe not enough if itís leaching from substrate but if itís just a little residual copper from your pipes or something like that it might help.

Do you use any fertilizers that could contain things they donít like?
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