UGF boxes work great in breeding shrimp setups especially for Caridina shrimp when you fill them with active substrate. It's a good way to lower the water pH without using too much soil making them very economical to use. Standard ugf boxes (like this one) only hold 1.7L of soil and only one is needed in the tank up to 60L. It can last for over a year!
This exact box using by professional breeder Darick from Shrimps Affair in all of his tanks (over 160).
I've been using undergravel filtration and particularly these UGF boxes in most of my setups for over three years with great success. You can find more information about this filter from my videos on my channel.
By buying this set you supporting my YouTube channel!
Thank you,
Leon from Shrimp Mania.