"As for introducing new fish, I usually feed my fish when I introduce new ones ... gives the old fish something to focus on besides their new tankmate. If the new fish grabs some of the food, great. If not, no surprise since he's likely a bit stressed."
glad we agree on one thing
As for the tank pad,
when your talking about putting glass down on a surface now lets assume that surface could have a kink or a slight hump in,
the pressure on a specific section would increase tenfold under the weight of the tank,
for peace of mind I would allways add a tank pad,
In simple terms a tank pad can consist of some form of material than will compress when weight is added creating in a sense a cushion,
Reducing any impact a specific hump/bump etc. could have on the glass,
Better to be safe than sorry,
But I'm sure you will find many different opinions
