I would opt for the lr
and skip the bio balls as their notorious for high no3
. You could start out with 50 pounds of lr
with no problem as i did with my 150 but you will want o add more as time goes on, You will certainly need more than a mag 9 pump. I would bump up to a mag 18 or you will need to add 3 or 4 ph
's to keep the flow good. A good rule of thumb is to turn the tank's water at least 10-15 times per hour and a mag 9 by the time you add the necassary hose to it as far as head pressure goes will likely be in the 500 gallon range. I'm struggling with this right now as my mag 18 just isnt enough for my 150. You will want to have some sort of a sand bed and I would opt for a dsb
in the 5 inch range, this will aid in the bio carrying load of the entire tank. With a dsb
you will have a healthy tank in time. I would also opt for two smaller heaters instead of one larger one so if you have one fail you have a back up and if one goes crazy and sticks on it wont boil your tank over. The uv
is unnessary as far as I'm concerned but some swear by them.
Just keep asking questions and I cant stress this enough as eager as you may be take your time, research everything out and do it right the first time or you will spend a fortune redoing it in 6 months.
Sounds like you have a plan set so go for it and good luck.