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i have a 3 ft fry grow out tank, in the last 48 hours the water has turned a bit green so i did a 30 % water change, as i did it i noticed the fry holding net which is hanging in the tank and quite heavily covered in algee had tiny little white worms not more than 1mm long.

to give more info proir to the w/c the fry net only had the bottom i cm of it covered in water, this section was heavily algee infested (there are no fry in it its only there in case i get another batch) after the wc the net was fully submerged, that is when i noticed these "maggots". the fry upon seeing them proptly devoured the entire population.

are my fry going to get sick?

did the maggots make the water green?

what are these maggots?

where did they come from?

any light that can be shed would be greatly apreciated.

Sounds like it may be planaria which are usually present in a tank that has excess of food/plant waste. They are harmless to fish unless we are talking about tiny newely hatched fry. Gently stir the gravel, you may find there are more in there. The best way to get rid of them is to reduce left over food in the tank and with gravel cleanings. (if in the gravel)

Are the things in you tank like these...
[link=http://images.google.com.au/images?hl=en&q=planaria&sa=N&tab=wi]http://images.google.com.au/images?hl=en&q=planaria&sa=N&tab=wi" style="COLOR: #004040[/link]

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Before you criticize someone walk a mile in their shoes. That way you're a mile away and you have their shoes.

If they are planaria, then your young fish won't suffer any problems from eating them. Planaria are a live food source for fish, and many aquarium fish seem to love eating them. As Lindy already said, planaria are found mainly in tanks with plenty of detritus that the flatworms can feed on, and so may indicate poor water quality.

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And when he gets to Heaven, to Saint Peter he will tell: "One more Marine reporting, Sir! I've served my time in Hell."

I used to breed these little guys, i would take some goldfish crumbles and soak them in water and leave it out for a couple days and the little white worms would come, then id feed them to my fish .

it could be like that only that i have no gravel (fry tank)

they were only in this little fry net thing, the fish are 1-1.5 cm cichlid fry but the worms are white not brownish like in the pic, there all gone now any way so no need to worry i hope.

thanks for the advice