If I can’t make the water colour naturally, it is ok to use artificial water colourants?
You can use artificial colourants but only for a short time. As a temporary solution apply around 6-12 bag per ha (it depends on the kind of colourant you are using, so make sure you check the manufacturers instructions carefully). The problem with using artificial colour is that, unlike a natural plankton bloom, there is no natural food for shrimp PL to feed on. It also cannot help to absorb ammonia and nitrite in water like plankton do. There is no substitute for a natural plankton bloom – it is necessary to prepare the shrimp pond to get the natural plankton.