dutchy;105226 said:The needed turnover rate varies because of tank dimension, amount of plants and hardscape.
dutchy;105174 said:I'm sorry, but I think the tank is too small for angelfish. They will not have the chance to fully grow up, probably you'll and up with some sad looking pygmea angels. because of their size and heigth, angels need at least a 40 x 24 inch tank IME. . . . [\quote]
I agree that the angelfish will not grow as large in the poster's tank, but so what? I've kept several angelfish in a 29 for long periods. They were healthy and often spawned, and they stayed in proportion to the other (smaller) fish in the tank, even though they grew to only about three inches in height.
I also trim my valisneria every month. Their "natural" leaf length is 20 to 30 inches, far to much for a 20 gallon tank.
Size isn't everything, right?
KingOfTheFeesh;113426 said:From what I understand, and what I have been told, stunting is never a good thing. Especially in keeping of large fish or "tankbuster species" (tiger shovelnose catfish, bala sharks, knife fish, etc.), stunting often results in growth defects such as deformities in the spine and skull.
Read this: http://www.seriouslyfish.com/stunted-growth-means-stunted-lives/
It has some pretty important information, especially towards the bottom.
Also, I don't believe that you can relate your vallisneria to the well-being of angelfish, aquabillpers. There are huge biological barriers separating plants from animals, most notably of which is plants inability to feel pain... (At least, as far as we know.)
Angelfish can get very territorial. In most cases (that I've heard of, at least), 29 gallons is not ever large enough for two angelfish - and questionably suitable for one.
Note, however, that most of this is not from personal experience but rather from research and from hearsay. It could be wrong - but that would make a whole lot of more experienced aquarists and scientists wrong as well.