Thats actualy not a bad idea with the rain drum, I live in the city though so I would be worried about contaminations but instead of doing manual water changes I could just get another 1200 gph pump from Danner (I think) that cost $100.
Keep me updated on that neon tetra 30 gallon experiment though.
i will update MFK members about it. but as said.. it will start a month from now once my 180 has been cycled completely and once i transfer all the dats to the 180 and the remaining goldfishes to the 60 with my sterbai corydoras. then by that time the 30 gal will be free.