What Tank Size Is Suitable For These Fishes

alvinkoh

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HI guys,

Am getting a new tank and intending to keep kohaku swordtails and orange mollies.

Am thinking of getting 3-4 of each type..

Do these fishes grow big?

What tank size should I get?

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Momgoose56

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Most standard Molly's grow to 3-4 inches in length. Sailfin Molly's can get up to 6 inches long. Swordtails grow to 6 inches.
A 29 gallon tank would be the minimum size for that number of those fish if you only get all males or all females. If you get males and females a 29 gallon tank will become overcrowded very quickly. A 55 gallon tank would be okay if you get both sexes and can rehome the babies when the tank becomes overcrowded.
Before you put any fish in a new tank, please fully cycle your tank. You'll save yourself a lot of grief, a lot of fish, and save even more $$$! There are Members here that can help you through doing a fishless cycle that is inexpensive and relatively fast. NOTE: Despite what fish store employees and product labels may tell you, no brand new virgin fish tank can cycle in less than 2 weeks. Most take 4 to 6 weeks to cycle adequately for full stocking.
 
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alvinkoh

alvinkoh

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By the way what are those bright orange color fishes? They look like platy or mollies??
 

Momgoose56

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It looks like both tanks have a mixture of swords and Molly's to me. There may be a couple of platys thrown in too. Hard to tell what species tho in the bottom tank. With all their fins clamped like that!
 

Coptapia

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Top pic, the orange ones are Swords (edit... they’re mollies), the red wag ones are platies, and there’s a few black Swords and black Mollies.

Bottom pic, all Swords, with a few guppies.
 

Momgoose56

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Coptapia said:
Top pic, the orange ones are Swords, the red wag ones are platies, and there’s a few black Swords and black Mollies.

Bottom pic, all Swords, with a few guppies.
Ha! I totally missed the guppys! Was just looking at orange fish!

Momgoose56 said:
Ha! I totally missed the guppys! Was just looking at orange fish!
Looks like there might be a stubby cherry platy or two in the bottom tank as well or maybe the angle. That pink lighting kind of makes it difficult to distinguish...
 

Coptapia

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Correction, I meant to say the orange ones in the first pic are Mollies.

Donthemon said:
Agreed, at least a 55 for Swordtails. I’ve had 6” Swords, they’re huge (and they dropped 500 fry every month).
I wouldn’t buy any if they’ve all got their fins clamped though...
 

Magicpenny75

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Momgoose56 said:
Most standard Molly's grow to 3-4 inches in length. Sailfin Molly's can get up to 6 inches long. Swordtails grow to 6 inches.
A 29 gallon tank would be the minimum size for that number of those fish if you only get all males or all females. If you get males and females a 29 gallon tank will become overcrowded very quickly. A 55 gallon tank would be okay if you get both sexes and can rehome the babies when the tank becomes overcrowded.
Before you put any fish in a new tank, please fully cycle your tank. You'll save yourself a lot of grief, a lot of fish, and save even more $$$! There are Members here that can help you through doing a fishless cycle that is inexpensive and relatively fast. NOTE: Despite what fish store employees and product labels may tell you, no brand new virgin fish tank can cycle in less than 2 weeks. Most take 4 to 6 weeks to cycle adequately for full stocking.
Well I learned a thing today. I've never kept either species, but I really had no idea that mollies or platys could get that big!! Sorry for off topic but WOW. A 6" molly would be pretty impressive!
 

Momgoose56

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Magicpenny75 said:
Well I learned a thing today. I've never kept either species, but I really had no idea that mollies or platys could get that big!! Sorry for off topic but WOW. A 6" molly would be pretty impressive!
Molly's only can get to 4 inches. Swords can get up to 6 inches. Most big Molly's top out at around 3" in a suitably large tank.
 
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alvinkoh

alvinkoh

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Thanks for the answers guys! Yeah most LFS squeeze all these fishes in a small tank for sales. And I have got the urge to save them all but powerless hahaha
 

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