BLACKWATER tank conversion - need advice - The Planted Tank Forum
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post #1 of 3 (permalink) Old 03-27-2018, 12:35 AM Thread Starter
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Lightbulb BLACKWATER tank conversion - need advice

Iíve got a shallow tank (8 inches depth) that I want to convert to a blackwater biotope, for less maintenance and more so for a change.

I will have some frogbit or a similar floater on top with white sand, manzanita, and some oak leaves Iíve collected from outside. Maybe a HOB filter with something like hornwort for increased nutrient absorption (in addition to my canister filter).

3 main questions then:

1. My pH is around 6.5-7 (CO2 fluctuates it). Will changing to blackwater, with a pH of say 5-5.5, kill my beneficial bacteria? Will I need to cycle again (Iím using a canister filter)?

2. I want it to be dark, like the bed of an Amazon tributary. What kind of light can I use that will grow the floating plants, but wonít leave me fretting about algae?

3. Every blackwater tank Iíve seen is pretty spotless of algae. Is this because of the low light and high acidity?
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post #2 of 3 (permalink) Old 03-27-2018, 12:53 AM
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Bacteria dies at around 4.0 pH.

End to end floaters will block most of the ligh, so, the light fixture is mostly for them. Low light and low nutrients help to keep algae away.
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post #3 of 3 (permalink) Old 03-27-2018, 01:46 AM
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Originally Posted by 0stress View Post

3. Every blackwater tank Iíve seen is pretty spotless of algae. Is this because of the low light and high acidity?
Mines got tons of algae.

Just a noob

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biotope, blackwater, conversion, shallow

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