[tpal]

I have 50g it's been a week that i have brown algae that cover everything i did a 10g water change does anyone know what it causes?

 

[Jessemac]

There are some questions that are in need of answers here. There could be many roots to this issue or just one. Find the source is the solution.

How long has your system been running?

What are your water perams at, in detail?

How much water circulation do you have?

What does your bioload consist of?

How much and how often do you feed?

What type of Lights are you useing?

 

[DIVERDOWN!!!]

with out any info, I would guess your tank is new (less than a month) and it's just cycling. if that's the case don't worry about it, it will clear up when the good bacteria matures.

 

[soverjas]

with out any info, I would guess your tank is new (less than a month) and it's just cycling. if that's the case don't worry about it, it will clear up when the good bacteria matures.

+1 probably a new system and the brown algae is likely diatoms.
Curing Brown Algae Problems in your Saltwater Aquarium

 

[dputt88]

You need to spend lots of money on media reactors and begin dosing half a dozen different products.

No im jk. If its a new system wait it out.

+1