My current set up is 7 guppies, three albino cory and one lace cat and two ghost shrimp. After learning more my set up WILL SOON BE three guppies, six albino cory, two ghost shrimp. I got my two ghost shrimp last week to see how they would do with my guppies before I bought the more expensive Japanese Algea eating shrimp, I heard ghost were sensitive and die off quickly but my two are doing great, active and one just had her babies. Going forward I want to get the more expensive shrimp but will still keep my two ghost. So in a 20 long with three guppes, six albino cory and two ghost shrimp, how many Japanese Algea eating shrimp would I be able to keep comfortably?