I recently changed my tank to sand. I have noticed green algae growing on it. Is there a certain type of fish or invertebrate that would clean it up? I have plecos but they don't work on the bottom. I had a friend that suggested ghost shrimp. I am not sure how those would work because I have tiger barbs that I am afraid would just eat them. I also have 2 pictus cat and a rainbow shark. I think ghost shrimp are pretty cheap though so if they did eat them it wouldn't be a huge deal but I was just curious on everyone's thoughts. Thanks.