[Im Lon 2]

I agree with adding to your system now. So both tanks match.

The only thing I don't like about the 6" tall tanks is it does not give them corals much growing room, if you have large plugs. But other than that a 175 watt MH would give them a lot of light even if you got a 12" tank.. I was looking at one, but wanted to go 8" tall, for that purposes.