I've had one adult, 1 juvenile, and 6 slings.
Slings rule, but apparently they can be a bit of a gamble. And they are a pain in the neck trying to get tiny crix into the pot.
Personally I would go for a sling if poss as there is something satisfying looking at an adult and knowing that you grew it on.
But I can understand why some prefer juves especialy when it comes to the slow growers and feeding can be a lot easier.
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