Is a 20 gallon tank good enough to quarantine 3 anthias fish for about a month? planning on putting a piece of seeded live rock in tank and have been seeding the filter sponge in my tank for about 2 months. Going to use a aquaclear 70 HOB filter. going to use half water from DT and half freshly mixed saltwater. Recipe for success or disaster? dont have an option to set up multiple QT's