Individual temperament kinda plays a big role here... just because fish A from family X survived and did well in tank Y, does not mean fish B from family X will do well in tank Z. Too many variables to say "mine is fine, yours will be too" in this situation. I've dealt with a lot of parrots, and if there is anything I have learned about them, they really do take on individual personality traits. I've seen some aggressive, some passive, some mutilated, etc. (not sure why they think it looks good, but some asian cultures cut off the caudal fin of blood parrots to change how the fish looks) One other thing I can say for sure is that they do get large.... I myself wouldn't keep one in a 29g tank, especially with other inhabitants, but that's just my personal opinion. Please keep in mind Buscamares, members of the forum can and frequently do share their experience and opinion, but not everything everyone says is "fact." Heck, what I've said above is subjective to my experiences, and does not necessarily reflect what will be true in any given situation. I'm just here to offer whatever experiences and observations I can to others, and absorb those which others share with me.
I wouldn't suggest keeping 7 discus plus other inhabitants to others on this forum, but thus far with my experience, my fish are doing beautifully. I'll be selling 1-2 of my discus this weekend (possibly just 1 for now, and see how the 6 interact from there) and will likely just add some cherry shrimp to complete the tank. Again.... just because I can get away with 7 discus in my tank doesn't mean I'd recommend others try the same. 5-6 seems a more appropriate number to me, depending on other inhabitants. (I know this part of my post is kinda off topic... sorry for going off on a tangent there)
The various different opinions and experiences are one thing which constantly draw me back to this forum... its both mentally stimulating and enjoyable to chat with so many people about so many topics. I myself just can't get enough of it.
