so most of us, has had the disappearing fish thing... I have cherry shrimp in my Hillstream tank... I think several, but 2 in particular that are very large and brightly colored, and are normally super easy to spot in the tank ( a 55 gallon ) but it seems like they disappear every other month, then reappear just like normal... I could understand if they disappeared for a week or so, at shedding time... but these guys disappear for a month at a time, and just when I figure, that someone must have eaten them, they both so up, like they never left... I've not witnessed any attempted predation... I like seeing them in there, so I notice, when and how long they are invisible... thoughts???