I have a 10-12" iridescent shark and two 10 inch plecos in a 55 gallon tank. In the next few months I plan on building a 600 gallon tank in my basement and was wondering what some safe tank mates would be for them. I was thinking about buying a fire eel as well, but was also wondering if that would be safe for either fish. The iridescent shark is about 4 years old now and I have a second one that's albino I recently had purchased but he's only about 3" so far. Any info on compatibility would be great as there's nothing out there on them in regards to tankmates. Every site just says to get rid of them and I'm just not willing to part. Anyways sorry for the ramble. Thanks guys.