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Discussion Starter #1
In the past 24 hours, all of my fish have died, except for one otto cat. I am going to do a large (50%) water change, and I am going to remove the glo-rock I put in the day before they started dieing. I need to know how I should restock the tank though. I prefer small colorful and playful fish. I want a betta but im not sure if it would get along with the otto. Any advice?
 

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First of all have you tested your water? How big is your tank? Maybe you overstocked? Bullying? Stress? Disease? These are all things you have to check for before you assume it was the rock. Even if it was the rock, whatever it leached into the water could very well still be there meaning you should do more than 50% water change. (Over the course of a week or two, not all at once.)
As for fish neon tetras come to mind. Platys, guppies, and other live bearers come in many vibrant colors.
Bettas and ottos as far as I know get along fine.
 

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Discussion Starter #3
First of all have you tested your water? How big is your tank? Maybe you overstocked? Bullying? Stress? Disease? These are all things you have to check for before you assume it was the rock. Even if it was the rock, whatever it leached into the water could very well still be there meaning you should do more than 50% water change. (Over the course of a week or two, not all at once.)
As for fish neon tetras come to mind. Platys, guppies, and other live bearers come in many vibrant colors.
Bettas and ottos as far as I know get along fine.
Everything started going wrong after I added the rock.
 

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i would have gone with removing all the water, ... maybe twice just to make sure any residual stuff was gone.

crzy, a % thing

removing 50%, and another 50% , and another 50% is still 12% remaining of whatever it was

removing near all (say stuff in the substrate is hard to remove - so 90%)
removing 90%, and another 90%, that's like 1% remaining isn't it ?

keeping the tank filled over-all in the attempt at keeping the bacteria alive to avoid cycling again.

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for what to put in the tank

while i think 10 gallons is too small

i like the cardinal tetra, and the green neon looks nice too (both are small)
 

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i haven't seen those fish anywhere, (the celestial pearl danio), i'm assuming they're out there somewhere, but dono where

green neons i have not seen, but should be far more common

as for cardinal tetras, ... inquire with your LFS if they can do a custom order for you, those should be almost easy to find

Edit: maybe not so much the box pet stores, likely they'll either have what your after or tell you to get what they do have
 

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could look into dwarf puffer fish

not exactly community fish, and can be territorial, i have heard 1 per 5 gallons to avoid issues, ... making a 10 gallon tank rather small
 

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tetras are usually very good

neon tetras, while a good standard, their abundance in the hobby has led to inbreeding issues (easy to see ones with kinked spines, and who knows what other health issues)
 

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while not complete, i spent a fair bit of time interested in all kinds of small fish, under 2", looking for even smaller for a rather specific purpose

to build a small self-sustaining tank
i wanted small fish (easy enough) that were omnivores (considerably more difficult for small fish) with a preference towards herbivore diet (suddenly small fish that fit this diet became impossible to find, most being 4" or larger, 6" for full herbivore)

it still did give me lots of time to look up all the pretty small fish
mostly tetras fit the bill, danio's are there too (some, the celestial pearl) i don't remember much now, but green neon at i think, 3/4", cardinal tetra slightly larger, ... the ones i recommended, ...

smaller fish are nicer for a smaller tank as you can fit more in there, instead of having a lone fish (all by his lonesome) you can have a school of fish going to watch ... from other information i have come across, ... more small fish also gives the illusion that your tank is larger than it really is, which is good

there are some fish that are under 1cm, great :), i've never seen any distributor for any of these, the smallest wants a ph of 5 i think, ... (same pH as your can of coke, and you know what's rumored to do to nails but that's all curiosities and possibilities, not realities.

unless some site has come up recently, i have not come across anywhere that lists fish according to size, which would be really nice if you want something special and unique and have a small tank, ... i'm not a web site designer, and have other interests, so i'll wait for someone to come up with such a site, then fall in love :)
 

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Discussion Starter #12
while not complete, i spent a fair bit of time interested in all kinds of small fish, under 2", looking for even smaller for a rather specific purpose

to build a small self-sustaining tank
i wanted small fish (easy enough) that were omnivores (considerably more difficult for small fish) with a preference towards herbivore diet (suddenly small fish that fit this diet became impossible to find, most being 4" or larger, 6" for full herbivore)

it still did give me lots of time to look up all the pretty small fish
mostly tetras fit the bill, danio's are there too (some, the celestial pearl) i don't remember much now, but green neon at i think, 3/4", cardinal tetra slightly larger, ... the ones i recommended, ...

smaller fish are nicer for a smaller tank as you can fit more in there, instead of having a lone fish (all by his lonesome) you can have a school of fish going to watch ... from other information i have come across, ... more small fish also gives the illusion that your tank is larger than it really is, which is good

there are some fish that are under 1cm, great :), i've never seen any distributor for any of these, the smallest wants a ph of 5 i think, ... (same pH as your can of coke, and you know what's rumored to do to nails but that's all curiosities and possibilities, not realities.

unless some site has come up recently, i have not come across anywhere that lists fish according to size, which would be really nice if you want something special and unique and have a small tank, ... i'm not a web site designer, and have other interests, so i'll wait for someone to come up with such a site, then fall in love :)
Cardinals sound good, and last I checked my LFS sold them. How many could I put in a 10 gallon with an otto?
 

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have a look online for 'cardinal tetra care', pay attention to the adult size, ... follow the 1" per gallon rule, ...

if you wish to push things maybe 2x that, but i wouldn't recommend that unless you're really confident about your tank health, ... considering recent events, take it slow, could start with 1/2 the fish till tank health is stable and go from there.
 

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There's probably something wrong with your tank if your fish are dying and putting in more fish will probably just result in those new fish dying until the issue is corrected.

That said, when you correct the issue I don't see real problems with neon tetras. Expect half to die when you get them in your new tank but after that, the ones that live should be good. Aren't cardinals much harder to take care of? I have never had them but that's what I've read.
 

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Okay, I'm going to be Debbie Downer here and start off asking this -

Do you have a liquid test kid for AT LEAST Ammonia, Nitrite & Nitrate?
If so, what are your parameters?

These are two very important questions that will help us figure out if it was the rocks that caused your fish loss or something else.

How long has this tank been running, what was it stocked with and how often were you doing water changes?

Answering those questions will help us help you in making the right decision.
 

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+1, never add anything to a tank unless you know about it's well being. Always, always, ALWAYS use a good trusted test kit. Liquid tests > test strips. I never add anything to a new tank until i have thoroughly tested the water and know that it is ready for new livestock.

API Freshwater Master Test Kit Aquarium Freshwater Test Kits

^one of the best deals around on a test kit.. normally $30 or so in store.

Otocinclus really need to be in groups. At least 3+ with 6+ being ideal. I'd also stick with 6+ on neon/cardinals if at all possible. They are a shoaling fish.
 
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