I have a 20 gallon long tank with 7 ember tetras, shrimp, and two bristle nose pleco. The tank has live plants. What are these flea looking creatures and how can I get rid of them. There are so many of them living in the tank. Some have managed to get into my 75 gallon I guessing from moving plants around. The problem is not so bad in the 75 gallon I am assuming due to larger fish and the team of Cory's. Any help is much appreciated.