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AAquadog he will know but haven't seen him on the forum lately. Also suggest start your own thread under shark and Ray forum you will get faster responses.
Unfortunately I do not know of a reputable vendor on this site. The only place that I know that is of high quality that also sells marine sharks is live aquaria but I have never ordered a shark from them so I can not speak on that topic. It's a shame
Zoodiver doesn't come around anymore. He would be of help here.
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AAquadog he will know but haven't seen him on the forum lately. Also suggest start your own thread under shark and Ray forum you will get faster responses.
Most fish and sharks I pick up in person here in CA. Not a big fan of online ordering. But if it's your only option, I would find a vendor who sources from ORA Farms in FL. I have also ordered from "Aqua locker", formally called "Fishy Business Aquatics". Been satisfied with their fish and service and they have a select few of sharks to choose from. For your size tank (300g) your selections are limited to maybe 2 or 3 species. The best being the marble/coral catsharks. The ones with the best personality I think are Bamboos, but it might outgrow that tank when it's two years old. Another option would be a horn shark, but it too will get pretty large. I stay away from smoothounds because they are pricey, and injury themselves a lot in the tank. Having a round tub will help, but they only live around 7+ years.
A Marbled Catshark is one of the few sharks successfully kept in aquariums. They need lots of room to swim, at least a well oxygenated 240-gallon tank.