Congratulations,
I set up a 12cm x 10cm x 10cm plastic tank with a mesh ca 2 cm from the bottom filled it with Horwart and put a pair of CPDs in it for 3 days, this was a test as i have 200 of these plastic tanks from my Betas days ( they were on a drip filter system) I also have around 7-8 young swimming around.
Mfg Peter