Dalmatian mollies are just cross bred fish. Anything can happen to their colouring because their full parentage is not known.
They may be too crowded. I have heard that mollies need 2-3 gallons per fish. My daughter's male dalmatian Mollie keeps nipping at the female and has killed 2 so far.
Goldfish should only live with goldfish except for a few exceptions such as a bristlenose pleco or apple snails for example
This means the ballon molly will start releasing eggs and the Dalmatian molly will fertilise them. The answer above is incorret really what that means is the mollies are breeding (yes ballon mollies can breed with dalmatian mollies). Mollies are livebrers, so the fry(Babies) are born swimming. If you go to... http://www.liveaquaria.com/product/prod_display.cfm?c=830+1101+1058&pcatid=1058 and http://www.liveaquaria.com/product/prod_display.cfm?c=830+1101+1062&pcatid=1062 you can find more information
Mollies are live-bearers, which mean the majority reproduce by giving birth to live babies.
NO!
No. Your tank is ridiculously overstocked. Your algae eater will eventually grow to the size of 12 inches long. Your mollies need more space. And your shrimp will soon die because of the polluted water from the overcrowded conditions.
domestic
Yes they are.
No they do not "need" salt in their water. Mollies (Poecilia sp.) originally came from brackish (Estuarine) waters and provided it is done very slowly they can eventully live in a marine environment, but they have been kept and bred in fresh water for so long now that salt is not a neccessity as it once was 60 years ago.
NO!
I would say a bubble nest yet mollies are live berriers are they real mollies then?