I have 2 six inch oscars in a 55 gallon(temporary) and they are both in one spot of the tank and not eating. I have sand substrate and they have taken all the sand from where they are now(not mating) and they have been like that for a week. Any advice? BTW i threw in some feeders yesterday and they ate some but hesitated a lot to go after some and other fish in the tank finished the feeders.