Algae

[Nagra92]

Is this alagae is good for tank ? This red & purple type
And can you tell me what is this thing which is eating my alagae
Is it hermit crab ?
should i take this thing out if tank ? Or is it eating my dead algae

 

[725196]

It is cyano bacteria, technically not an algae but is referred to as red slim algae. You can get some red slime remover from a LFS and it will help. However you need to get your parameters in line, most notably phosphates and nitrates.

 

[JaykS]

It is cyano bacteria, technically not an algae but is referred to as red slim algae. You can get some red slime remover from a LFS and it will help. However you need to get your parameters in line, most notably phosphates and nitrates.

Agreed, red slime remover will work but it’s a bandaid on the problem which is nutrients

 

[BourbonLegend]

Also agree, cyano. Second photo shows plenty of green hair algae, you need to get your nitrate and phosphates in order.
This also appears to be a hermit crab. There are mixed opinions in regards to them in reef tanks however i keep a couple with no issues.