How deep should substrate be?

Joined
5 Jan 2008
Posts
1,976
Reaction score
41
Location
JHB
Bought some Aragonite. How deep should I make my substrate in my nano?
 
Joined
5 Jan 2008
Posts
1,976
Reaction score
41
Location
JHB
A bed that shallow will not result in nitrif/denitrif hey? I think i'll go 2.5 - 3cm
 
Joined
5 Jan 2008
Posts
1,976
Reaction score
41
Location
JHB
Not sure if I want it for biological purposes or just easthetics...

If its shallow the aragonite will still function to buffer the pH etc?
 

jacquesb

Retired Moderator
Joined
29 May 2007
Posts
17,868
Reaction score
71
Location
Cape Town
Matt - what LikesFish means, is "do you want to use the DSB for denitrification purposes" or "just for how it looks"?

For denitrification purposes, I would suggest to rather go +-8cm deep (if you can)...

For "how it looks" - go for 2 to 3cm thick...

To answer your question:
If it is shallow, then you would NOT get any an-aerobic areas where acids would be formed by the biological process. Only if these acids are formed, then the aragonite would be able to be broken down to buffer the tank....
 
Joined
10 Sep 2007
Posts
9,395
Reaction score
26
Location
Centurion
yip, and it depletes very very slow.
i did some research on this topic before using it as dsb, and buffer cap is very slow.
 

Mike

Retired Moderator
Joined
12 May 2007
Posts
7,859
Reaction score
31
Location
the Motherland
Use arogonite around 20 - 30 mm deep, purely for aethetic means, but any sand bed made of any sand will eventually have denitrifying qualities - which are a positive.
 
Joined
20 Jul 2007
Posts
939
Reaction score
15
Location
Canada
I would never use larger stoned sized gravel even for a shallow bed as it will accumulate detritus.
 
Joined
4 Dec 2007
Posts
891
Reaction score
9
Location
Alberton
So is sand better for a DSB than using larger stone sized gravel?
hi snobee,
The finer the gravel the better for a dsb. I'm using river sand for this purpose.
But then you'll have to go a bit deeper than 2 cm....
 
Joined
18 Apr 2008
Posts
11
Reaction score
0
Location
Somerset West
Is it ok to have about 4cm of course gravel and then 2cm of sand in the DSB... or will that serve no purpose at all?

edit: the course gravel being at the bottom.
 
Last edited:

Tobes

Retired Moderator
Joined
30 Nov 2007
Posts
9,482
Reaction score
119
Location
A Beautiful place!
Use 0.2 - 2.0mm size substrate and make it 6-8 inches deep for best results in denitrification. Don't use coarse coral sand - detrites will build up and cause high nitrates later on and then cyano and then big headache...:wave2:

This works for normal DSB in a sump or refugium, too deep for your nano - won't look good and you're gonna loose too much space.
 
Last edited:
Joined
15 May 2007
Posts
2,899
Reaction score
118
Location
Bloemfontein
Is it ok to have about 4cm of course gravel and then 2cm of sand in the DSB... or will that serve no purpose at all?

edit: the course gravel being at the bottom.
It would not have any advantages, and could have quite a few disadvantages (depending on the size and thickness of the course aggregate). I would suggest you only use a well graded, fine sand throughout the sand bed.

Hennie
 
Joined
6 May 2007
Posts
1,494
Reaction score
38
Location
USA
It would not have any advantages, and could have quite a few disadvantages (depending on the size and thickness of the course aggregate). I would suggest you only use a well graded, fine sand throughout the sand bed.

Hennie
Ditto. You can't keep an effective sand bed in a nano tank. Any sand you use will be aesthetic (or perhaps to create another niche for worms/pods/etc.)
 

Top