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I used it for a while and decided to stop after reading about the many benefits of having tannin and other organic compounds in the water. There's plenty of science to back this up and@jayc will no doubt be able to point some of it out for us. However that's not to say that shrimp wont necessarily be happy and breed well in tanks filtered with purigen. I guess some breeders probably do use it 24/7 still although I know of a few who tried it and decided shrimp did better without it. Aside from nitrate control it might be a good option for people wanting to breed the australian native zebra shrimp (likes extremely low TDS) in aquariums. And it certainly does make the water crystal clear as@Brentwillmers pointed out. Fantastic stuff for a display tank!

Please Please Please More pictures. They are amazing shrimp and I wish you the best of luck with them. I am guessing that no matter the colouration/ patterns of the parents you will get varying colours and patterns in the offspring, the offspring may even be chameleon- like in not sticking to a set colour or pattern in the aquarium. I guess the only way to tell would be to set up LOTS of tanks with individual pairs, matching a set male with a set female and then seeing what offspring they throw. And from there selecting the most desirable offspring and pairing them up again as single pairs to see what they produce. I think it could go either of two ways, either the shrimplets will be carbon copies of their parents or more likely you will find even greater variations between the original pairs and future generations.

If you really want an inert white sub then try pool filter sand. About $20 for 20kg bags so you will get way more than you need but it works well for shrimp. Food tends to not go through it so there is no build up of uneaten food like in a gravel. Depending on the supplier, some is very white and some just off white.

this Bluebolt is a breeding machine. Time to catch out the Bluebolts and give them their own tank again.