ive never kept a shark before but i have kept marines, you WILL make mistakes and its better to make these mistakes on a smaller scale with less expensive fish.
Although a larger volume of water is always better, maybe try keeping a shaol of small fish for six months then add some preds then add the shark six months down the line.
Although a larger volume of water is always better, maybe try keeping a shaol of small fish for six months then add some preds then add the shark six months down the line.