So im new to the planted tank hobbie and started around 2 months ago, my current setup is 10g w/ DIY co2 and a penguin bio-wheel filter system.. my co2 is connected to a Lee's diffuser which is hooked in the middle of my tank.
So anyways, i bought 10 cherry red shrimps from petshrimp.com (here) and they all came in alive and it was a good speedy service, thanks

, so after about 2 days or so i see less and less shrimps than i usually see in the morning swimming about and around. And today i only seen one shrimp, i have no other inhabits in my tank, i did see a snail yesterday but it was a small one and i took it out.
Anyone can tell me whats wrong with my setup or maybe i didn't give it cabbage to eat?