Mixing salt water is super easy if you run your RO/DI into a separate container ( I use a igloo fish cooler) like a rubbermaid trash can. Drop in a heater and a powerhead or spare pump add salt, check, add more salt (till you get close but under SG. Let it churn over night, recheck and adjust as necessary. Check later in the day. If it's right you're ready to change water.
I think that what Lee may be trying to say in a very nice way is that you may have added the goby a bit sooner than others would. Personally I'd say Kathy, you added the goby too soon. But then I failed tact101 and got a D+ in diplomacy.
