Black water biotopes generally use a lot less light than that. 4x 54w T5HOs on a tank that size means you're going to need to blast the CO2. This is fine if you can get enough CO2 in there but it won't make a very good blackwater biotope. Also, these kinds of biotopes use very little, if any plants so certainly no hairgrass carpet. Sorry to rain on your parade, just a few things to consider
HTH