What's a reasonable number of nano-fish in a 2.5 g? - The Planted Tank Forum
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post #1 of 18 (permalink) Old 11-16-2007, 03:15 AM Thread Starter
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What's a reasonable number of nano-fish in a 2.5 g?

Assuming it's actually less than 2.5 g because of substrate, and ignoring fish per inch rule since that is useless, how many dwarf corydoras or salt and pepper corydoras do you think would be reasonable and look nice at the same time?

I know theoretically you could stick like 10 of them together if you have superb filtration, but it would look cramped and ugly.

So how many do you think would do well together and look nice at the same time? I know cories school, so maybe 6, no more no less? My tank dimensions are 8 wide x12 long x 6 deep.

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post #2 of 18 (permalink) Old 11-16-2007, 03:46 AM
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None, Cories like to be on groups of 5+. 5 or more would be to many for a
2.5g. Do somthing like 6 neon tetras in it.
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post #3 of 18 (permalink) Old 11-16-2007, 03:55 AM
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Agree with matt s.
However me, i would do smaller schoolers that are like 1 inch each (thats just me i love my tiny fish =D)
Don't forget cories like their substrate space.
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post #4 of 18 (permalink) Old 11-16-2007, 04:18 AM Thread Starter
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Hmm.. good point.

I forgot they need their substrate space!

What do you think of Boraras maculatus-dwarf rasbora?

http://images.google.com/images?hl=e...-8&sa=N&tab=wi
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post #5 of 18 (permalink) Old 11-16-2007, 04:21 AM
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Ya like 6 or so of those could work.
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post #6 of 18 (permalink) Old 11-16-2007, 04:59 AM
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6 Neon tetras would be way too much for a 2.5 gallon. Not to mention your tank wouldn't look too nice because of the huge fish in it (in comparison to the tank).

Check out franksaquarium.com and they have a nano-fish section and all of them are suitable for a 2.5 gallon. I bet you could get 6 or so boraras species living happily in it.

Just a word of warning though, if you go with Microrasbora kubotai, make sure your tank is not open top. It is jumps readily and I lost 4 in this way. I'm down to 1.


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post #7 of 18 (permalink) Old 11-16-2007, 05:40 AM Thread Starter
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Yikes they jumped?!

Probably won't get those, since they're not in the area anyway.

Alright so I'll go with the bororas maculata in a month or something, once the tank is cycled.
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post #8 of 18 (permalink) Old 11-16-2007, 01:51 PM
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Just for size perspective...

I have 3 pygmy cories in my 5 gal, and want to get 2-3 more (not sold locally very often, and it's all I have left from a larger school bought over a year ago), but I think that any more than a total of about 6 would be too crowded. Imagining them in a space half the size, I wouldn't do more than 3, but they seemed a lot happier with a bigger group. They're fun though, and don't restrict themselves to the bottom of the tank, just spend a lot of their time down there.

I had 3 Microrasbora erythromicron for a couple years (who died before I found out what they were and how lucky I was to have them... given to me by a friend who was moving, and didn't know what they were)... I can imagine all 3 in the 5gal easily, but I feel like even as tiny as they were, they'd've been crowded in half the volume. I don't think I would have wanted more than about 5 in the 5gal tank.
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post #9 of 18 (permalink) Old 11-16-2007, 03:15 PM
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I personally don't suggest Dwarf cories in anything less than 10g. They prefer bigger groups and are more schooling than other cories IME. Some of them (C. hastatus especially) don't spend all their time on the bottom and they don't "sit around" like other larger cories. They need room to swim around and school and 5g is not big enough. 10g minimum for Dwarves.

I've also heard the Micro rasboras needing a larger tank to swim around in. I've never kept them though, so can't say from experience.

I wouldn't put any fish in a 2.5g....just some small shrimp and even shrimp like room to roam around. Would you want to live in a closet?

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post #10 of 18 (permalink) Old 11-16-2007, 10:03 PM Thread Starter
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Hmm makes sense.

Maybe not any fish then.
Shrimp/snails sound like a good idea for sure.
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post #11 of 18 (permalink) Old 11-17-2007, 05:12 PM
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In my 2.5 gallon I have 1 Dario dario, 5 ember testras, 4 RCS. It seems like a good arrangement. The Embers tend to swim in the front area, the Dario explores the back.

Micro rasboras are tiny, they should be fine in a 2.5 gallon.

That being said, I do daily water changes due to the bio load.
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post #12 of 18 (permalink) Old 11-17-2007, 05:40 PM
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Quote:
Originally Posted by JustOneMore21 View Post
I personally don't suggest Dwarf cories in anything less than 10g. They prefer bigger groups and are more schooling than other cories IME. Some of them (C. hastatus especially) don't spend all their time on the bottom and they don't "sit around" like other larger cories. They need room to swim around and school and 5g is not big enough. 10g minimum for Dwarves.

I've also heard the Micro rasboras needing a larger tank to swim around in. I've never kept them though, so can't say from experience.
The pygmy cories seem to be fine in the 5gal (I believe they're C. pygmaeus), but I wouldn't want to go smaller. The footprint of this tank is a tad bigger than the usual 5gal tank, I think; about 16"x10". They're definitely bottom-half-of-tank fish, with the majority of time on the bottom, but they certainly spend time in the lower middle levels; when they were in with other schooling fish, they'd occasionally pretend to be tetras or something :P They are quite active and fun to watch.

The micro rasboras I had were very shy, and were usually hiding somewhere in the bottom back of the tank, but they were also in a 38gal community tank, and it might just have been too much activity for them. I did see them in all areas of the tank at one time or another, but they didn't seem all that active; they mostly 'hovered' when I saw them. I only had the one tank at the time, so moving them into a smaller tank for themselves wasn't something I thought of. I'd say a 5-10 gallon would have worked for them, along with a few more friends, but like I said, they may have been more active if they'd been in a small tank by themselves or with other more quiet fish. I'd love to try a 10 or so with them and maybe shrimp one day, but I suppose it'll have to wait til they're more common (and I have more time and money and space ;P). Super cute, though, and very striking markings.
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post #13 of 18 (permalink) Old 11-18-2007, 02:56 AM Thread Starter
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Reeferton,

Daily water changes seem like a chore. But since it's such a small tank I understand your point. So the micro rasboras idea is still on.

equus_peduus,

I already have pygmy cories, and I understand what you mean. They'll swim all over the mid-bottom level, and occasionally pretend to be a real cory or a fake tetra. Either grazing the bottom for food, or thinking they are tetras and schooling with them (to no avail). I don't think I'll go with pygmy cories in the 2.5 gal because they seem to like a lot of swimming room.

I like how you mentioned micro rasboras as very shy fish. Nobody ever mentioned this to me before. So if you're right, they'll thrive in a smaller, quieter tank than a large busy community tank with more aggressive fish.


How do you think fish deal with the dry fertilizers though? I dose KNO3, KH2PO4, and trace elements. I'm mostly worried about KNO3 for the fish and shrimps. And maybe the copper in trace elements for the shrimps.
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post #14 of 18 (permalink) Old 11-18-2007, 04:12 AM
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EI dosing of dry ferts has never harmed fish or shrimp in any tanks I've heard of or dealt with.

-Jared
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post #15 of 18 (permalink) Old 11-19-2007, 06:55 PM
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I've got 5 Male Endlers in my 2.5.


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