thanks alter40, it would be interesting for people who just have enough money for make a really nano reef tank to consider all possibilities for begin this phase of the hobby. I have one live rock, two real crabs (one of those looks like a prisoneer because it´s black and white), some red shells and one little annemona.
all had a price of US$13 aproximately, because i bought them in colombian coin (i´m from Colombia) and i´m just beginning in this area.
In the other hand I have a couple of oscars and they grow really fast giving them live food. I feed them with feeder guppies because they are not so big enough for eat a goldfish