Hey,
Ady,whats the TDS from the tap?
I know your wanting to keep Crystal red shrimp, so on the tds front one of the best things to have is a small bucket. In your case probably 5 litres, some airline and one of them airline taps.
Put them all together and you get a drip acclimatiser
I don't know how the 'salty shimp' raises tds, is it a powder? Therefore slowly. Or a liquid? Which will increase tds instantly?
I would recommend Mosura Mineral plus, its a liquid allowing you to adjust tds instantly before adding to tank.
Regards,
Nathaniel