Sheppard said:
what kind of work and care would you have to do in order to do that?
and how many could you overstock a 120?
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You'd have to do alot more water changes, be alot more strict about feeding, be alot more watchful of aggression, basically everything you already do but taken to a much higher level.
This is Hollywood's overstocked tern tank, they're all basically full grown and you can see he's nowhere near 20 gallons per fish.
http://www.piranha-fury.com/pfury/index.ph...topic=66451&hl=
Now, don't confuse my showing Hollywood doing it with implying it's easy, because it is not, in fact it's extremely difficult. Hollywood is about as close as you're going to get to an expert hobbyist and I personally wouldn't try something as ambitious or difficult as what he's done, but it's just used as an example. With extra work, overstocking is very doable. In a tank where the fish are going to grow up together like that, the workload will gradually increase as the fish get bigger, and the owner will know if he's able to keep up with the amount of work involved or not. I wouldn't recommend someone going right out and buying 1 fish for each 10 gallons, but letting your fish grow into the tank is a good way to ease yourself into the overstocking experience and see if you're willing to keep up with the workload or not. It's for that reason that I don't like the idea of telling someone "you have too much in your tank" because they know better than the person telling them wether their setup is working or not.