Gha

Here is a pic of the brown stuff that keeps comin back and turns into GHA

 

The stuff is alrezdy growing back after i moved all the sand around.

 

That doesn't look like GHA to me. Looks more like diatoms.

 

Looks like diatoms and it's normal in new tanks. Just siphon it out when you do water changes. You could also add a powerhead to prevent it from growing on your sandbed. Another culprit is excess nutrients, which is normal for newly cycled tanks. There are usually 3 main things that cause it..

1) Excess nutrients
2) Low flow areas
3) Change in the light spectrum due to old bulbs.

 

Well that is the stuff that grows in GHA in my case. I will re-angle my powerhead to hopefully stop it.
I have a phosguard to lower my phosphates.
I will fix the bulbs.
The algae did stop for awhile and nows it coming back. Is this normal? I think it might contribute to why I woke up and my emerald crab was dead this morning.

 

We need to know what the Params of your water are in order to help you out...
Nitrites?
Ammonia?
Nitrates?
PH?
Phosphates?
Salinity?
How old is the tank?
Temp?

 

Unless it's an early case of dinoflagellates, it's not something that would kill your emerald crab directly.

What would kill your emerald crab is a high level of nitrates - one of the things algae requires in large quantity in order to grow....