Planted Tank Guru
Join Date: Apr 2011
Location: Hamilton, Ontario, Canada
Yes, that's shrimp poop. Part of the reason most people use black or dark substrate, can't see the poop. It also helps the red shrimp look more red. Shrimp, try to a very small degree, to blend into their environment, so on a darker substrate, they will be a bit redder and darker as they try to blend in. On a lighter sand like that, they will go a bit lighter. Decent fire reds shouldn't go very much lighter though. Cherries can go almost clear though as they aren't as dark as the fire reds.
20g platy, , 2 x 10g shrimp, 3 x 20g shrimp, 7.5g shrimp and 1 great dane/mastiff puppy.
Sump Pimp #2
My Tanks and my shrimps