Super tiny orange blob??

[BluerSkiesAhead]

View attachment 1254659
Does anyone know what these little buggers are? They are very, very tiny. This is the best photo I could do on my phone. They seem to multiplying rather quickly.

 

[P-Dub]

They look suspiciously like red planaria... http://colorreef.blogspot.com/2018/07/how-to-remove-red-planaria-flatworms.html

 

[KJ]

Flatworm Convolutriloba sp. and Hydroids Medusa.