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Shrimp dying

Joined
5 Feb 2012
Messages
33
Location
Colchester Essex
Hi can anybody please suggest why my shrimp are dying. I’m finding a couple almost on a daily basis. Small nano cube tank 20 litres. Regular weekly water changes about 75% although even before a change all water parameters are acceptable. I have 11 chilli rasbora in the tank that are healthy and unaffected. I feed the shrimp about once a week, I drop in a tab for them but there is a small amount of algae that they graze on too. I use water with a TDS of about 220, our tap water is very hard so I cut it with RO water. Only started happening in the last couple of months and nothing changed in my routine.
just wondered if it’s happened to anybody else and welcome any suggestions.
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MichaelJ

Member
Joined
9 Feb 2021
Messages
1,165
Location
Minnesota, USA
Sorry for the loss! What type of shrimps? What other parameters do you know about the water (besides TDS) ? What tabs are you feeding them?

Cheers,
Michael
 

matthewwoodgate

Member
Thread starter
Joined
5 Feb 2012
Messages
33
Location
Colchester Essex
Just your average cherry shrimp. nothing expensive. I feed them nanovit tablets. Ammonia, nitrite and nitrate are all very low all the time basically. PH is around 7.6 most of the time.
 

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MichaelJ

Member
Joined
9 Feb 2021
Messages
1,165
Location
Minnesota, USA
Just your average cherry shrimp. nothing expensive. I feed them nanovit tablets. Ammonia, nitrite and nitrate are all very low all the time basically. PH is around 7.6 most of the time.


What are you dosing for fertilizer? Could it be copper buildup (inverts are super sensitive to Cu as you probably know) ? Do you have enough Calcium/Magnesium in your RO mix? what do you use for remineralization. Whats the ppm out of the RO system? Do you dechlorinate the RO water?

Shrimps dont care about elevated nitrate levels (unless mine are an exception) ... Ammonia/Nitrite will kill anything, as we all know...

For now, let's disregard the Nanovit poisoning the shrimps - which is an obvious possibility. Starvation is another; feeding only once a week sounds a little lean. Of course, all depends on food amount, number and size of those shrimps.

Cheers,
Michael
 
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