I here you.But its not the money,its the wife.i have to take her slow.I have a filter that is rated for a 400g tank.My plan is to use that one filter to run the 125g for fish only i have and the 75 for reef i am looking for.I will pipe them together with alittle mods that b&b is going to do for me.So when or if i go bigger i will only need tank and some new piping.I would love to build one though.Do you have plans on that 500g.