I need some comments and advice

[SpeckledGrouper]

The tank came with 3 sockets and 3 bulbs, that have nothing written on them except 400W.

So I don't know what k they are, I am also taking a pair of VHO's (actinics) from the old tank.

I am concerned about the heat, so far I never had a serious problem, I do have a 1/3hp chiller.

 

[Angelscrx]

The 1/3 hp chiller won't be big enough to handle the bigger tank. Also depending on the dimensions of the tank and what you want to keep in it three bulbs may not be enough either.

IMO I would add at least one more bulb and a bigger chiller.