Typically they are not recommended for community tanks with smaller fish, because they can be quite hostile, even by themselves.
At least be sure you don't get more than one Red-Tail Shark. They become very territorial.
Anyway, nice that you're getting into fish - watch out though -fishkeeping is an addicting hobby!! I've been keeping fish for over 10 years now. Love all my scaly friends
Note of advice - stock up on meds. You will need them. Unless you want to buy lots of replacement fish, LOL. (I can give you more info if you're interested)
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