VaughnH - you might be right about the OD on KNO3... after re reading the numbers , I rounded up twice too so your figures might be more appropriate. You bring to light one question I had, is the nutrient dose based on plant mass or attaining a certain concentration in the water. If for plant mass, you could take all the plants out of a 55 and put them in a 240 and dose the same amount because the plants are the same. But if you tested the nitrate and phosphate like so many do you'd get really weak concentrations, which is why it seems we are dosing for a certain concentration (that would include all gallonage in the system like sump tanks, etc). Not that it really matters, just something I've often wondered about.

Thanks also Gerryd, I'll make some adjustments and use that for my base dosing. I figure of course I might have to make adjustments later as well. On my 75G I am higher than IE dosage and still struggling with maintaining nitrates at 10 or more... but on the 240g it wont be that dense even when its full I dont think.

I'll reduce the KNO3 some but it should be dosed at 3X the K2PO4 correct? That would mean I need to also reduce K2PO4 since my figures maintained that 3:1 ratio.

Ok it would be a lot easier dosing the full amount from day one if you guys really suggest that. I will try some fast growers to start out with also, I am just not sure if I am going to really be able to fill the volume, I am going to have to add a lot extra. My long term goal is to not have any fast growing stems - at least ones that need trimmed, I'm hoping this will be a low maintanence type setup once it gets going. I dont want to have to actually get in the tank any more often than every month or two. And I might have to empty out all the local stores for stems But I guess I can always sell off the stems on the forums when my main plants fill in,maybe re coupe that cost. I do have a little rotalla in my tank right now that I havent been able to completely remove, that stuff grew like it was going out of style.