Any one know what these are?

JayCow

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I have these little guys gliding all over glass any ideas?
1000002021.jpg
 
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JayCow

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WalkerLoves_TheOcean

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It's a year and a half old and fish recently died. Just added a mimic tang.
Flatworms, when they die do release a toxin into the water column, though I don't think this is what killed your fish, it is a possibility.

So just be careful when trying to get rid of them.
 

EeyoreIsMySpiritAnimal

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Ok, they're probably just growing in numbers without any natural predators. Do you have coral? They can possibly affect them but only in large numbers...

From the interwebs:

Rust Brown Flatworm

The Rust Brown Flatworm (Convolutriloba retrogemma) is the most common flatworm found in home marine aquariums. It is rust brown to tan in color with a bright red dot about three-quarters of the way down its body and will reach a size of about 1/4". They are oval and somewhat elongated with two tail-like appendages. It reproduces rapidly in nutrient-rich marine aquariums. In high concentrations on a coral's surface, these flatworms can actually keep adequate light from reaching the corals, effectively starving the coral.
 
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JayCow

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Ok, they're probably just growing in numbers without any natural predators. Do you have coral? They can possibly affect them but only in large numbers...

From the interwebs:

Rust Brown Flatworm

The Rust Brown Flatworm (Convolutriloba retrogemma) is the most common flatworm found in home marine aquariums. It is rust brown to tan in color with a bright red dot about three-quarters of the way down its body and will reach a size of about 1/4". They are oval and somewhat elongated with two tail-like appendages. It reproduces rapidly in nutrient-rich marine aquariums. In high concentrations on a coral's surface, these flatworms can actually keep adequate light from reaching the corals, effectively starving the coral.
That does seem to match the bill here
 

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