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Discussion Starter · #1 · (Edited)
Hello,

Is it normal to get a green tint in the water of my aquarium every time after i put Tropica specialised nutrition in the tank? The water is clear, but has a green tint that doesn't go away without changing almost all of the water.
Plant Flower Terrestrial plant Water Leaf vegetable

This dirty brown stuff is all over the plants and the soil, and most of it doesn't scrub off.
Water Plant Pet supply Organism Aquatic plant

Can't see the green tint so well in these photos for some reason.

30l cube.
Dennerle scapers soil.
Tropica Specialised nutrition.
ONF flat nano on lowest brightness because of the greenwater algae outbreaks.
Plants: 2 Anubias nanas, java moss and some vallisneria nanas.
No CO2.
Treating tapwater with Tetra aquasafe.

I add Specialised nutrition 2 ½ ml every week.

I have had the tank running for 4 months, nothing has grown, most vallisnerias have dissolved, but alive ones keep spreding instead of growing.

30% water changes every 3 days, or the water turns from green to brownish. Vaccuming the soil every week.

Ph is a tad low, but i use strips so it's a little hard to tell exactly. I bought an electronic ph meter, but it is not yet calibrated.


I would like to have clear water, instead of it always being green, but no idea what to try next.
I have not had the confidence to add fish thinking they will make it extra hard to deal with the algae.
 

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Have you tested your water for nitrates after a water change? You have easier plants that don’t need much fertilizer, plus your soil should be releasing some too.

Why are you vacuuming your substrate? You don’t even have any livestock.

ONF Light at the lowest setting isn’t helping either. Raise it instead with 50% brightness.

Do you have pics of your tank?
 
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Discussion Starter · #3 ·
Have you tested your water for nitrates after a water change? You have easier plants that don’t need much fertilizer, plus your soil should be releasing some too.

Why are you vacuuming your substrate? You don’t even have any livestock.

ONF Light at the lowest setting isn’t helping either. Raise it instead with 50% brightness.

Do you have pics of your tank?
Nitrates have been around 0-10ppm.
That's true, i was adding nutrients, because i had no idea about the amount of nutrients in the soil (package has no information)

There is some fluffy buildup of algae or dead plant mass always stuck on the substrate pebbles, so i thought by vaccuming it, i would get rid of the excess whatever is causing my algae outbreaks.

Okay, i will try that.
Every internet help article said to lower light volumes to fight greenwater algae, so i have been keeping lights low.

I will try to add photos.
 

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You definitely don't want to disturb the substrate even if you have fish. Active substrates will release ammonia and definitely enough to start a algae bloom like green water. Literally don't move any of the granules. I agree with those plants you probably don't need to dose ferts at all right now, although I'd be surprised if that's the problem.

How deep is the tank?
 

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Discussion Starter · #5 ·
You definitely don't want to disturb the substrate even if you have fish. Active substrates will release ammonia and definitely enough to start a algae bloom like green water. Literally don't move any of the granules. I agree with those plants you probably don't need to dose ferts at all right now, although I'd be surprised if that's the problem.

How deep is the tank?
Oh man.. I never knew that soil is not supposed to be vaccumed. Should i add a layer of sand etc. on top of the soil? I have some black aquarium sand that never got used.

I will stop adding ferts for now, and see if there is any improvement.

The tank is 30cm deep from rim to soil.


Thank you for the answers!
 

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I never knew that soil is not supposed to be vaccumed.
Pretty much every soil and clay-based substrate like this explains on its packaging that you shouldn't rinse it before use or disturb it beyond the occasional replant once in place. And in planted tanking, vacuuming is frowned upon because plants feed on the muck and the mulm that settles and develops in the substrate - even with gravel and sand. Merely siphoning visible debris from the surface of the substrate is usually all that's required.

Should i add a layer of sand etc. on top of the soil?
No. Sand will ultimately settle beneath the active substrate you're using because it's heaver and has a smaller grain size.
 
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