[Supercoley1]

I have only ever had GDA once. when I first began. These were the days when I tried to use DIY CO2 with high lighting and snake oils for ferts

When I rescape these days I get nothing IMO planting heavily from the outset once you know you have good flow, good CO2 and good ferts means it doesn't appear

When I say heavily planting I mean that even the 'pros' can struggle with it on lightly planted tanks such as Iwagumis etc.

Peter Kirwan's mountainscape that won in the comps last year suffered and this was just HC and rock

AC

 

[Supercoley1]

was the only change you made to add more KH2PO4 powder into the tank? or did you change anything else at all?

Sometimes there is something else that happened at the same time and people assume it was the factor they were aiming to alter that brought about the result.

I don't get GDA whether I increase or decrease PO4 however if I decrease the PO4 I get more GSA. Up it and I get less. Up it too much and I get more plus cloudy water.

There is IMO a balance for PO4 rather than being able to throw in as much as you want.

AC

 

[Supercoley1]

if it is rough it is more likely another algae and not GSA. Is it flat to the leaf? AC

 

[Supercoley1]

Gsa is very thin and grows like a birthmark on the leaf. It doesn't raise away from the leaf at all. It is flat sort of like a discolouration of the skin. A Dark green mark on the leaves. Normally on Anubias you can see some in even the most perfectly balanced tanks.

If it protrudes from the leaf at all then it isn't GSA.

AC

 

[Supercoley1]

That means it isn't GSA. Otos won't eat GSA. A picture would enable us to ID it for you

AC