Right now I have 2 ID sharks in my 55g. They are about 3-4". If I can't find anyone with a big enough tank to take them I will get a 200g to keep them in. From the species profile it said that was the min. tank size. Anyways could I keep anything else with them? If so, what would be suitable tankmates? They seem like such shy fish but I'm sure they will outgrow that.