Unfortunately unless we can get at the black shrimp and cull everything else constantly we will always end up with a few blues etc. I tried for sometime to get just blacks but I think it must stem back from when the blacks were first being bred here and nearly always kept with chocolates. Even back in my 2013 colony that i got from Dean there were blacks and chocolates together. The blues didn't start turning up straightaway but even with culling I ended up with all 4 colours. i know many people have the same issue when trying to breed the blue diamonds- blue from black -they have to cull hard and constantly and truthfully I don't think any or at least only a few have a large colony of blue diamonds that breed 100% true.
You need to try and find a few blacks that don't show the deep blue - try putting them in a white container near a light source - you will see the blue/black colour more readily -if you are lucky enough to get a trio of true black without the blue base you might get started -good luck!
Thank you for the imput Ineke. I too started with a mix of chocolate and black, nearly lost the lot thanks to an invasion of dragonfly caddis's and I ended up putting the few survivors into my 1000L pond. Months later I found chocolates in the pond and got interested in trying to get a good tank of them again.
I swear my black cherry shrimp tank is determined to do my head in...….Almost every shrimp in there now is either blue (and practically all the shrimplets are blue) or a very definant blue/black. And the 4ft where I put all the dark chocolates are now producing lots of blacks. I know its an odd thing to complain about, getting too many blues, but come on I really loved the glossy all black cherry's.
Oh and on a side note. In the dedicated Blue cherry tank I am getting deep blues, clear blues (diamonds?) and apparently for good measure blue rilli. And there is no way the shrimp can get between the tanks because no swapping around of plants has occurred and the tanks are a good 2-3m apart over a concrete floor.
What parameter are you keep taiwans tibees?
What tds you get wiht salty shrimp mineral?
And what gh?
1 have 3 same tanks 100liters, same setups.
In one there are tibbe and taiwan, i get them months ago, dont loose anyone.
They breed but i dont have babies...
I saw one baby with molting problem dead.
In the other tanks there are crs cbs , they breed like crazy and i have lot o babies, the survation of babies is very good.
My water is
128 tds ppm , it raised to 140 because of the fans.
Gh measure 5 (jbl)
kh 0 ( api)
ph 6.4 (api)
Mineral salty shrimp gh +
Also another tank, wiht hybrids, same water , same substrate, f1 taiwan x crs , taiwan x tangerine tigers babies grow fast....
Babies survive also is very good.
I think i try to lower the gh to 4 ...