Question about weight on top of tank

[Jason McK]

As you can tell by the pic, my lighting set up is less than Ideal. My biggest problem is I can not drill into the ceiling because I have radiant heat from the ceiling. So drilling holes would puncture the heat pad and I would not be able to heat my house.
There are studs in the wall but the tank is not centered on the studs, as you can see.

Now I would also like to lower the lights.

This is my idea. Cut into the canopy so that the lights would slide into the canopy supported by "L" brackets. The fans would be able to vent I could get rid of the monstrosity of chain and plant hangers and my likes would be lower.

My question is will the tank take the extra weight? Is there any rules of thumb for weight set on top of the tank.



Thanks
Jason