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Okay so I only have the Minibow 2.5 with 5 freakin Molly fish...
If you get a 20 gallon aquarium, you'll be able to keep your 5 mollies there. I would only add a few small fish in there. Those mollies can grow to 4 inches.
This is really a question that is almost impossible to answer. If you are talking about your tank with 5 Mollies then you need 20 gallons but if for just a beginner who is not sure what the fish are that they want a 10 gallon is a nice choice. A good betta tank for those who do not have much space is the 5 gallon. So you see, it really depends on the purpose you have for the tank.
In my opinion the best size of tank for a beginner is a 20--it's not to huge or hard to handle, but it's easier to maintain tahn a 5 or 10 since it has a larger volume of water so it is inherently more stable. If you make a mistake in a 5 or 10 gal it has a lot more impact than a 20. However many people who do not have the room or money start out just fine with a 5 or a 10.
For you Cowizzle, you need at least a 15 gal tank to house 5 adult Mollies, and a 20 would be better. A 2.5 is really too small for any tropical fish.
BettaBuddy ~ Miley
I have a 1.5 gal but will be getting bigger soon. Miley
25 is good to start with imo
Start with the largest you can afford. You and your fish will be happy. 20-30 gal make nice community tanks and don't take up a lot of space. Guppygranny
I started with a fishbowl I now have a 55 gal. although because of the addiction my fish have for me withdrawl is not an option so I must upgrade agn I thk I am goin to get a 150 we'll see I know once I get to the pet store I will see more fish and wow when does it ever stop?....Clint
start small-a 10 or 20 gallon would be a good starting tank