I make a new batch when I use the one I made at the last water change. I don't add the ca and mg until I use it as I find it ends up with a lot of precipitation if I add it at the same time. I plug my heater in the day before if it needs it.

Hey sounds like my house, except the tubs blue and its in the middle of the kitchen.

Same with me. Mix it up and dump it in. No problems whatsoever with anything in the tank.

10-20 minutes. Whenever it dissolves it goes in. In order to heat the water up - I use my electric kettle to heat up the RO water just before I start draining the water from the tank...

You use your kettle with tap water too? Leaves behind calcium and lime deposits just like the build up in a coffee pot. I'm sure some of that would be released back into the ro water if you do.

Mix a batch with ro/di, then put the heater in and wait till it reaches temp, usualy 1-2 hrs. Never any problems

i just pour my salt into my fish tank.

A little warning: Twice I mixed up Seachem Reef salt and let it sit circulating in a 20gal garbage can with a small powerhead for about a month between water changes. The first time I did a water change everything looked a little ****ed off, the second time the tank crashed; 2 coral colonies, 2 fish and a brittle star died. The tank was a 4 year old 135gal. There was nothing directly wrong with the salt, when I used it again after letting it mix for less than a week everything was fine. But for some reason it seems seachem can not be allowed to sit and mix before use for a month.

I keep two 12 liter jugs of salt water pre-mixed. One jug let's me do both of my nano's. I usually don't let them sit for more than 1 to 2 weeks.

Realy, i wonder why that is? S***Y deal.