trial and error sound right to me, thats the way i do every project then once im done they say ohh, dam you should of done it this way or hay man my cusin works for a concreet place you could have got it for free... I want to kill those people...
as for making somethin look small, i should show you my wallet, smaller ponds cost less... remember that, your what $500 in, well im 4-6... thousand... and a year away from compleating, well it all goes well. i admire your work ethic and the rate that your compleating this, its a real feat and a exelent final product... as for the filter, fill it with boiballs/lavafock/plastic scrubbie sponges for bio filtration and s0me of that fine white filter stuff for polishing, it it gets green add a turbo twist uv filter... you dont even want to know what i have planed for mine..., thi filter is the easyest thing, if you where to use some of that easter basket stuffing that would work too., did you get a pump yet, that guy off ebay is realy cool about prices and shipping, he has a 3000gph pump for sale now.