[Myka]

It sounds like you could use a couple more powerheads. If money isn't an issue i would buy one or two more of the 6055, and add them to your controller. You can turn the flow down if needed. I like to have at least one powerhead placed behind the rockwork to keep it clear back there. Make sure that the powerheads aren't blowing at eachother which just creates a turbulent area, and diffuses the flow, which reduces the effectiveness of the powerheads. One of the main points of the powerheads is to keep detritus from settling on the sandbed, so if you see detritus settling somewhere, reposition or turn up the powerheads to get at the dead spot.

With your rockwork, it's mostly about personal preference. There are a few suggestions that you can try to accomplish. Try to have as few rocks in and touching the sand as possible. Try to create as many open spaces (tunnels and caves) between the rocks as possible to increase flow through them, and give the smaller fish a place to retreat. try to keep the rocks from touching any of the side glass. You will make small scratches, and it is easier to clean when there are no rocks touching it. Place all the bottom rocks onto the bottom glass of the tank, and then push the sand around them. If the rocks are set on the sand when the fish and critters in your tank move the sand around, they can cause a rockslide and/or crush themselves. It is a good idea to epoxy the rocks in place once you set them to prevent a rock slide which can potentially crack or scratch your glass. Creating two mountains on each side, and then a more open space in the middle is a popular design. Do a search, and find something you like.

T5s should be about 4-6" above the water. Be sure to clean the bulbs and reflectors of salt spray often to keep optimal light intensity.