Hello!
I have a 4 month old, 12g. Nano cube, 16#'s LR, 1 tailspot blenny, 1 green clown goby, 1 peppermint shrimp, several snails & corals. Last night I was taking a look at the tank with the lights out and saw 2 black, slug like looking things. 1 had a white stripe down the middle. They...