PETFISH i think i might have figured it out.
as you know,black water extract reduces the PH and GH of all environments. CHERRY SHRIMP DO NOT LIKE THIS. Only caridina (crs cbs tigers taiwan bees) appreciate this effect. This in turn reverses the optimum environment that saltyshrimp gh/kh+ has been made to do.
This will probably be the main reason why the sunkists aren't to their full potential. well it's pretty obvious thats the case now considering saltyshrimp products are meant to bring the gh to 8 and above while yours is 6-6.5.
also, easylife water conditioner is another set product that has another set combination of minerals that isn't specific to shrimp. i know it claims to be good for all life forms but when you add two sets of minerals. that's overload plus using black water extract....well what you've done is actually created a very unstable environment.
IF you use these products seperately during different times of the week.....i can only assume the shrimps have to moult a lot more than usual as well in order to adapt to each changing water parameter stressing them out a lot.
please don't take offense mate, but You don't need to overdo it all. keep it simple. saltyshrimp gh kh plus is really all you need.
there's other things that i can mention but in spirit of the thread it is definately out of topic and not in favour of what we are trying to do. help you get the colours out. next time don't feed them to your fronnies untill you truly know it's not you mate.
and for the record, i sell juvies all the time. it is a very common practice. but each to their own
hope that helps heaps.