I actually meant use cement blocks to support the tank, not the stand.
It is very easy to accidentally knock that tank off that stand even though it is only halfway full. I do see that you also have a canister filter on that tank so you really can't set it on the floor.
The baseboard heaters don't normally get that hot so I wouldn't worry about them breaking the glass from heat.
If you are handy and have some basic tools, you might be able to make a simple 2 x 4 wood frame to support that tank properly.