black molly?

2-3 months

and they might not grow as fast as some babys

silver mollys grow a bit faster than black mollys

This depends on many, many different factors. How large in the tank? How many other fish are in the tank, how often do you feed and what do you feed. How often do you change the water and what is the temperature of the tank.

To get good growth rate in mollies, or most other fish for that matter, you will need to feed often (4-5 times a day) with a wide variety of quality foods. Mollies will need loads of meaty foods but also some vegetable matter, so a well balanced flake is a good idea along with brine shrimp, daphnia, mosquito larvae and similar smaller creatures.

Changing 50% of the tank water daily will also support fast grow as well as maintaining a temperature of around 80-82F The larger the tank and the fewer fish sharing the space will also increase growth rate.

Now, no matter what you do they will only grow so fast, but with proper care they should get to 1" in about 5 weeks and 2" in 3 months or so. It's really impossible to narrow it down any more than that as genetics also plays an important role in growth rate.

MM

Mollies grow slowly. 3 to 4 months to get close to full size is a good estimation. It all depends on how often they are fed, water conditions being kept optimal and plenty of space in the tank.

well..i have had 2 mollies for 4 weeks now in a 5 gallon tank and in a 10 gallon tank and they grew to be 2 inches

I breed mollies and growth depends on what your feeding them and how often! It usually takes 2-4 months to reach full size! Also depends on sex of fish! Male mollies are us ally smaller than the females! Hope this helps! I feed mine ground up flakes and bloodworms.

If you feed molly fries with daphnia for the first two weeks and then go head with black worms for next couple of weeks. With in a months time it can reach the size of 1-1.5 inches. Within two months It reaches the adulthood.

Growth of each mollies differ based on the breed and the feed.

it depends on the size of your tank as well. so if you have it in a small tank, it may not ever grow much