I know the count on several tanks but tanks like my 45 gallon endler tank just get an eyeball estimate that tells me it is about the same as yesterday, somewhere around 60 to 80 adults and older juveniles with uncountable fry. The pair of kiliies that have their own tank, the 4 Ameca splendens in their own tank, the 6 Xiphophorus helleri, the 5 Goodea gracilis in their own tank are all ones I can count though.