I have braced my stand to the wall studs using truck tie-downs/straps. This is to prevent the stand from toppling over (tank is fairly narrow).
The tank is acrylic, so I am less afraid that it will break than glass owners, where seams can come apart due to flexing. With my stand design, it is unlikely that the tank would come loose from the stand, but I suppose it's possible. I am considering an over-the-top tiedown to better attach the tank to the stand.
I will post pictures and a diagram as soon as I can (next week, probably).
The attitude of "you have more to worry about than your tank" is true only for a big quake. In that case, no reasonable amount of prep will protect your tank (or your house FROM your tank). This type of preparation is for handling smaller quakes, where an unsupported tank may fall over because it is top-heavy, or glass seams may break (one reason to have acrylic).