Silver Dollars will care for their young, but will be no match for the aggressive fish in your crowded tank. If you intend to breed them, I'd suggest moving them into a 100L tank or larger.
I've seen other threads where you've indicated an interest in breeding many species. To be successful at breeding, you need to research the needs of each fish, and keep the parents in a tank large enough to allow the fry to grow. Further, you need to closely monitor the nitrogen levels (ammonia, nitrite and nitrate). Fry need pristine conditions.
thx I do have a 20L with a peacock cichlid in it. I have been interested in breeding many types of fish so do you suggest I give him away so that I have a breeding tank or should I just buy another tank?
I have a few links for you. The one below states that once the eggs are laid, the parents need to be removed or they will eat the eggs and or fry:
This one states the parents will not eat the eggs and fry:
Wow, possibly 2000 eggs too!
I have 8 Silver Dollars, I've seen them go through the mating process, they'll chase each other around then stop side by side and just quiver. I've never had any survivors due to having tank mates.
My best suggestion is to separate a known pair from tank mates, let them spawn and see what Mother Nature decides. Will the parents eat them? If they do then you'll know next time to remove the parents.
I am seperating my 7 silver dollars in my new tank I bought last week
7 ft long 2 ft deep and 18 inch wide
at the moment they are trying to breed like mad in my trigon 190 but my oscars are lifting all my gravel so I presumed they were eating the eggs .
reason for the new tank .
only thing I need for the tank is a descent external filter .
hope I get some luck