How Many Fancy Goldfish In 37g Tall (+overstocking?)

Samantha Levine

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So this question may be very simply answered and I may just be being stubborn, haha. But I've done loads of research on fancy goldfish and the tank space they need and so on.

I currently have a 37 gallon tall tank that is cycling with 5 zebra danios. Would I be able to get away with 2 fancy goldfish (I'm leaning towards Oranda) in this tank? Or would this best be suited for just one?
I've heard a lot of conflicting answers when it comes to taller tanks and fancy goldfish. Also, I've learned that Zebra Danios are a somewhat safer species to keep with fancies since the danios are fast, though I know there can still be casualties.
So in light of that, would keeping the danios with either one or two fancies overstock this tank?
 

75g Discus Tank

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What’s the filtration?

2 fancies could fit, but they poop a lot so you will need good filtration.
 
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Samantha Levine

Samantha Levine

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75g Discus Tank said:
What’s the filtration?

2 fancies could fit, but they poop a lot so you will need good filtration.
I currently have a filter fit for a 30 gallon and another for a 20g. I am definitely going to amp up the 20 gallon filter because one, it sucks. And two, I feel like I just should get a larger filter. I was thinking another 30 gallon filter, but what would be best?
 

Rtessy

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I mean technically a canister would be best, but those r expensiveeee. Get something that turns the volume of the water over 8-10x an hour, maybe even 12
 

Rojer Ramjet

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Canisters aren't expensive; they're priced commensurate to their abilities.

"Good for up to 30 gallons" really doesn't mean it'll filter a 30 gallon aquarium appropriately, just that it will, as a minimum, move "up to 30 gallons an hour." To what amount? Once, twice turnover?

If you've a heavily populated tank, and two any kind of goldfish in a 30 is heavily populated, as said above, you'd want 10+ turnovers an hour. That either means a canister filter or professional HOB.

Which goes to my first point; why rig something together when you can use the right thing to begin with? Especially if you're bent on heavily populating you aquarium?

When I decided on my Fahaka, I did it right; large aquarium, two 500 gph canisters, daily 10% water changes, and twice weekly 50% water changes - correct substrate, correct live foods; we gotta make their lives as comfortable as possible; imagine being in prison, and you had to breathe your cell mates fecal discharges, and drink his urine...
 

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