"barebottom" Vs "1cm Depth Fine Gravel + Corydoras"

ThomasDickson

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After a camallanus worm outbreak I am rescaping my 30gal tank.

Just wondering what are the pros and cons of
A. Barebottom tank and selling my 7 bronze corydoras
B. Shallow (e.g. 1cm depth) very fine gravel with 7 bronze corydoras.

The tank will be medium flow as I have honey gouramis and will be a riprium with pothos/duckweed. I have a internal filter and no sump.

Some questions
- with corydoras + shallow gravel do I need to gravel vac?
- would shallow gravel contain good bacteria?
- would fish waste get sucked into filter easier with barebottom or stick to the gravel?
 

FishFish221

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Yep, you will need to gravel vac the debris stuck in between the gravel.
Gravel will contain minimal amounts of beneficial bacteria, but will still contain some.
It doesn't really matter, since debris will get stuck on the bottom whatsoever unless you have a powerhead or something facing the bottom.

If the gravel has sharp edges, it can also damage the corydoras' barbels.
 
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ThomasDickson

ThomasDickson

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Thanks fishfish,
Is their any depth of substrate that won't require gravel vac with corydoras (e.g. 5mm or less)?

Would the small amount of beneficial bacteria have a noticeable effect on ammonia compared to barebottom?

That's good to know with the powerhead, I 'll look into it, thanks.

Yep, the gravel is smooth
 

California L33

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You'll need a grave vac no matter how deep your gravel is- and you'll need it even if you don't have any. Cleaning the bottom of the tank is like cleaning the yard if you have a dog . I don't think any powerhead that won't make your fish dizzy will stir the waste up so much that you'll never need to clean the bottom of the tank.
 

FishFish221

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You will need to gravel vac the gravel no matter how deep it is, but there's always the option of using sand. The amount of beneficial bacteria won't really be noticeable compared to the filter.
 

smee82

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The only way you can get around vacuuming is by planting your tank.
 

smee82

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The Rover said:
Can you elaborate on what you’re defining a planted tank? Is that organic potting soil underneath sand?
No, just by having lots of plants in your substrate to use all the fish waste as fertilizer. You don't need potting soil to have a planted tank.
 
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ThomasDickson

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This really confuses me.

A rooted plant can absorb fish waste as nutrients and then you don't need to gravel vac. Couldn't floating/riparium plants absorb fish waste in a barebottom without needing to gravel vac?

Am I missing something?
 

DoubleDutch

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Huh ? Plants don't prevent you doing vacuuming the gravel. If a tank is in balance there will be less maintenance though.

Especially for Corys the choice for a thin layer of sand better than a bare bottom tank. Corys benefit of food bacteria that house there. The most beneficial bacteria for the nitrogyn cycle are in your filter though.

Never saw bare bottom rivers or lakes in South America (or Asia)
 
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ThomasDickson

ThomasDickson

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Oh ok, so even for dirted planted tanks you still need to gravel vac. That's good to know.

Is 1cm depth of sand ok for corydoras or does it need to be more to hold enough bacteria for them.
 

peapod

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ThomasDickson said:
Oh ok, so even for dirted planted tanks you still need to gravel vac. That's good to know.

Is 1cm depth of sand ok for corydoras or does it need to be more to hold enough bacteria for them.
I was always told that 1-2inches of sand so the cories can sift through and act.as normal as possible. But npt.sure.if it really does matter to their health? I am sure it make them happy though.
 

DoubleDutch

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ThomasDickson said:
Oh ok, so even for dirted planted tanks you still need to gravel vac. That's good to know.

Is 1cm depth of sand ok for corydoras or does it need to be more to hold enough bacteria for them.
In fact that is enough but if you like to have plants I'd make it thicker.

We talked about vacuum sand / gravel.
I've no experiences with dirted tanks !
 

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