Bringing home a 4-5" sargassum trigger next week and need to QT it. I have a 10g tank that is up and running awaiting my next fish but this is too small a tank. I know most don't recommend having LR in the QT tank but I had extra so there' around 10lbs in there that couldu be pulled out if I need to treat the fish. Would a 20g be decently sufficent to house this fish if I keep a close eye on amonia. Hopefully the LR will help a bit...