Hello. I have been struggling for the last few weeks on what to do as far as stocking with my 75 gallon tank. I just got it a few weeks ago and its empty right now but will be up and running in 2 weeks when I move. It will be filtered by a Fluval 406 and a Marineland 350b (currently on a well established tank). I originally bough the 75 because I wanted to do Geophagus Red Head Tapajos. I was dead set on these guys (and their insane price) but was scared off by a post on another forum stating that they "cause you to be a slave to water changes and tank maintenance". Another guy at my LFS also said they need half RO water. I am planning on using straight tap water, and really dont want to mess with RO. I live in Indiana, so our water is fairly hard here but have read posts that says Red Head Tapajos are of the most adaptable Geos. I guess what Im asking for here is that is there any truth to the "slave" statement and RO water claim? Does anyone have experience with these guys? What dithers would go well with them? Ive read that, assuming I can do them without RO, they liked to be in groups of 4-5 and was planning on 4. Help! Any other suggestions of stock are welcome as well. Cheers