Help Needed - What Are These?

Hi All,
 
So I have had my tank for about 8 months now.
 
Its stocked with shrimp, 1 x Hillstream Loach, 8 x Snail (Zebra & Apple) and 2 x Platys.
 
Everything has been fine though unintentional both the shrimp and snails are breeding well, but I have suddenly have had an influx of worm like things. There was a couple at the start but now there are hundreds. I am thinking that they are Planaria but I am not sure.
 
My tank size 65l. My filter is a Fluval U2. Its a cold water tank, no real plants.

I was feeding them a large pinch of fish flakes in the morning with six Shrimp & Snail pellets and a small pinch of fish flakes at night.
 
I have tried water changes and reducing the amount of food but instead of it getting better its getting worse.
 
I have read about Genchem No Planaria but am unsure if everything will be OK in my tank if I use it. I know it can kill snails which has me worried.
 
I can remove the snails to another tanks if need be while dosing.
 
Any help would be great or if there's any other product I can use please let me know.
 

Does look like planeria, kind of hard to tell but thats what I would say anyway, planeria.
 
Planeria do come in different colour of usually either white or a light brownish/red colour.
 
A couple of links that may help you -
 
http/www.practicalfishkeeping.co.uk/features/articles/how-to-solve-a-problem-like-planarians
 
http/www.planetinverts.com/killing_planaria_and_hydra.html