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Can anyone tell me the optimal M/F ratio and how many Sterba Cory`s you can keep in a 20"x 10"x 12" tank? Same question for Panda Cory`s?

Thanks

the optimum ratio i have found is 4 males to every 2 females but it depends on the species some prefer a 1- 2 -1 ratio but thats usually the longer nose types. i have a breeding group of 7 fully grown(60mm+) sterbai in a tank not that much different in size and they do well. panda being a much smaller species you could get maybe between 8 -10 adults in a tank of that size

What type of filtration do you use?

i use mainly corner filters or box type but add an extra power filter for some extra current if i'm trying to spawn them