tuwa

First it was only on parvula but now most of it is on substrate? What can i do?

davemonkey

What is your lighting routine (Watts per Gallon, duration, type of fixture...)?

Also, are you using ferts/supplements? How often do you feed you fish?

Having that info will help get you better advice on what to do about the algae.

tuwa

35-30-30 cm 31,5 liter

Lighting: Tekfen Wiselite PLC-26W/865 6500 Kelvin 1350 Lumen florescent

Substrate: First 3 liter lava rock then 3 kilograms Aquaclay there are a netting between them.

Fertilizing: Sera Florena, Seachem Flourish Excel, Micro element (DIY) Potassium (DIY).

Afyounie

Is this a new tank. I had something like this growing on the driftwood, and the substrate at first, but it went away. It looks more like a type of fungus though. Maybe you don't have enough water flow. What kind of filter do you have on it?

tuwa

I am using this filter:

tuwa

Yes it is a new tank nearly two months

ombcat

It looks like filamentous green algae. Usually forms when there is not enough water circulation and the habitant is perfect for it's reproduction. You can take a small brush or a new toothbrush and clean as much out as you can. This algae is most often seen in ponds and set-ups with little water movement.
wilma

Missy B

I had this same problem on my new tank, but once I put it on a consistent fert. and CO2 schedule, the issue went away.

Cheese_It

I have this same problem in my 20H but in much larger quantities. I have about 6.75W/g from two AHS power compacts. Circulation is more than adequate, I have an Eheim 2213 canister which is thoroughly cleaned every month. No fertilization or CO2 right now. Feeding is done every day in very light amounts for 8 harlequin rasboras (don't know whether that's relevant). One of my plant species was completely covered in the stuff and lost all its leaves, became brittle and died. No other type of algae has been seen in my tank aside from this (if it is indeed algae). If anybody has any information that might help, I'd appreciate it. Thanks!

MatPat

With 6.75 wpg and no CO2 or fertilization it is pretty easy to see why you have an algae issue If you can drop your light levels back to around 2wpg you may be able to reduce your future algae outbreaks but you will not eliminate the algae currently in your tank.

If adding CO2 is not possible, at least look into adding some Excel as a carbon source. I honestly don't know how effective Excel will be with 6.75 wpg over your tank though. You really should look into fertilization also. If you feed your Harlequins lightly, there probably isn't enough fish waste or leftover food to provide enough nutrients for the plants given your lighting level. I would guess your plant "starved" from a lack of nutrients.

If you want to keep your current lighting level, you need to add fertilizers and pressurized CO2 to the tank.