Hmn. Let's see:
No filter. The system is hard-plumbed. I had experimented with canister and wet/dry in the past, but I like the hard-plumb the most. Very quiet as well, it's a MAG Drive 1200 that is externally plumbed into the system.
I made a mistake on the substrate. I'm using 250# of pool filter sand. I didn't know about Profile when I filled the tank, otherwise I would have gone with that alternative. Cost was certainly a factor. I typically only grow plants that don't require too much root feeding, and since I'm using EI on that tank, the plants have about as much ferts as they can handle in the water column.
Lights? I got em... 2 400W MHs set to run in an 11 hour sequence. The peak output is only about 2 hours, but 5WPG seems like a lot to me.
I have some plans for this tank. Depending on what happens in the next couple of months, I will be rescaping it with Profile, elatine, glosso and some very large rocks. Currently I am growing out a field of glosso (growing well in filter sand, no less!) and several pots of Profile-filled canisters of elatine. Not looking forward to the planting session, but I *am* looking forward to sitting in front of it and saying "Wow that's awesome."
At last viewing, the tank looked like this: