big size is a size big enough that your aro won't try to swallow. you want to avoid the scenario where your aro swallows your CL and chokes in the process. as i have mentioned earlier, CLs have spines under its eyes which it can use as defense mechanism.
i just keep mine at room temperature and they haven't got a problem with it.
i personally don't deworm my fish unless the fish is showing signs of internal parasites or if the fish is wild caught. all fishes live with parasites in them their entire life unaffected.
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