Not Many Fish, That's All I Can Fit?

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Lana1049

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A while ago I posted a thread about stocking ideas for a planted 20 gallon high. I got this tank for Christmas, where I put a clown pleco (with dead driftwood, of course), and 3 mollies in it. I was told that this tank was overstocked because mollies get big. Is there really no other option for fish or invertebrates to get in this tank? I wanted to get a couple swordtails, but now I'm rethinking it.

Oh, and just one more question.... Why do people always keep bettas in such small tanks?
 

Lana1049

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First, I will rehome the 3 mollies, they need a bigger tank. You can get a school of rummynose tetras, and make sure you keep your temperature at 78-80 degrees.

Why do people keep bettas in small tanks? Because it works.
Okay, thanks again. I know this sounded a little desperate, I just wanted a little diversity in the tank I feel a little bad that I had these mollies in an undersized tank for 2 months. What would be the minimum tank size needed for mollies?
 

ashenwelt

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Okay, thanks again. I know this sounded a little desperate, I just wanted a little diversity in the tank I feel a little bad that I had these mollies in an undersized tank for 2 months. What would be the minimum size of tank needed for mollies?
That actually depends on the Molly. There are several varieties. Shortfined Mollies, lyrtail, sailfin and giant sailfin are the most common. What do you have?
 

Lana1049

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That actually depends on the Molly. There are several varieties. Shortfined Mollies, lyrtail, sailfin and giant sailfin are the most common. What do you have?
Not completely sure, but here are all of them (tried zooming them in so it would be clearer what kind.... The two yellows are females) Sorry if it is a little blurry, they swim so fast!
20170330_184759-1.jpg
20170330_184915-1.jpg
20170330_184918-1.jpg
 

Lana1049

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That actually depends on the Molly. There are several varieties. Shortfined Mollies, lyrtail, sailfin and giant sailfin are the most common. What do you have?
I think I probably have a gold dust and black lyrtail, and I don't know about the one with circular fins.
 

ashenwelt

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The minimum of mollies is 29 gallons. They need a lot of space to swim.
Lyre tails are actually a variety of sailfin normally. As such long term a 37 is better for them in my book than a 29, plus they dive around.

The other issue is they have a much higher bio-load than most other fish, closer to a goldfish actually.

Honestly you could grow them out in a smaller tank but most people never upgrade.

I am always conflicted with mollies because the bio-load is in many ways the big issue. They are fairly dirty fish... That I freaking adore.
 

Rivermonster

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29 is recommended, but if your filter has sufficent area to hold a bb colony large enough to support the amount of fish waste then you'd get away with them in a 20 gal. Providing you keep on top of nitrates and other build ups with water changes, which you may have to do more regulary with the smaller volume option
 
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