Will adding Co2 to a gravel substrate planted tank cause algae issues? - The Planted Tank Forum
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post #1 of 5 (permalink) Old 04-29-2020, 12:24 PM Thread Starter
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Will adding Co2 to a gravel substrate planted tank cause algae issues?

Hi,

I have a 750litre tank which I plan to set up as a planted tank

The plan is to have a at least a 6cm gravel substrare (2-4mm), with liquid fertaliser and the addition of co2 (not lots of co2) via a external reactor.

I am now being told that if I were to add co2 to a gravel tank without an aqua soil then this would cause slow growth and cause major algea issues....

Is anyone able to confirm or deny this?

The reason for having some co2 in the tank was that I was advised that this would be best for the tank and plant growth.
The reason for not having an aqua soil was that I would have needed 100kg+ of aquasoil which was around 400+ which i couldnt justify if it needed replacing in a few years

Just wanting some advice before wasting anymore money or time on my co2 setup

Plant wise I would be only using easy/medium plants

Many thanks in advance
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post #2 of 5 (permalink) Old 04-29-2020, 12:31 PM
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Quote:
Originally Posted by matt769 View Post
..

I am now being told that if I were to add co2 to a gravel tank without an aqua soil then this would cause slow growth and cause major algea issues....
BAD ADVICE

Quote:
Originally Posted by matt769 View Post
..
The reason for having some co2 in the tank was that I was advised that this would be best for the tank and plant growth.
GOOD ADVICE

Co2 increases growth substantially, assuming your dosing is sufficient and co2 is consistent. Increased growth means more uptake of nutrients and toxins from the water reducing algae potential.

Last edited by Asteroid; 04-29-2020 at 12:52 PM. Reason: .
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post #3 of 5 (permalink) Old 04-29-2020, 01:32 PM Thread Starter
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Thanks for the reply

I did think that if I am doing the correct amount, correct maintenance that the presence of co2 shouldn't cause major algae issues when having gravel vs a soil - yes a soil will provide more nutrients but If i am dosing and have suitable plants I hope that its not an issue

Cheers
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post #4 of 5 (permalink) Old 04-29-2020, 02:13 PM
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Yep, plenty of stunning tanks on here run with inert substrate and CO2. I'd go so far as to say the majority do.
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Nothing good happens fast in an ecosystem.
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post #5 of 5 (permalink) Old 04-29-2020, 09:35 PM
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Gravel is actually more of a problem in low tech tanks with no co2 or fertilizer.

Issues appear when there is no real substrate to collect decomposing materials to then feed to the plant roots. Gravel essentially kills the area that plants need to feed from, causing algae and toxic environments.

Put another way, soil based substrate is required for long term, low tech tanks with no filters. Another option is to vacuum the gravel a lot.
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