I rescued a rosy barb from a tank that had not been cleaned out since around October, all the fish died in it but this one fish. This fish sadly didn't make it, I had been keeping it in a 5 gallon tank that I bought from Walmart. What's the best way to sanitize this tank so it's safe for another fish? The tank came with an Aqua-Tech 5-15 power filter, what's the best way to sanitize this so it's also safe? It came with a 'Bio-Fiber' part in it, that says not to rinse it, not sure if you can buy a new one of it or not. Is there a way to clean both of these so that they're both 100% safe for another fish? Thanks so much.