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Google green water. Too much nitrates/crap in the water.
Get some oxygenating plants and do a water change if you can to dilute the nitrate. The plants will use the nitrate for food/fertiliser. If you have enough oxygenating plants in there it will balance out and the water will stay clear.
Fish and water boatmen will eat other insects/tadpoles etc. best not to introduce either if you can. Or duckweed as you will never get rid of the stuff.
Dogtemple
@Scrabble
Thanks all. I'll get a picture tomorrow. It is pretty small. Seen those little solar pump things. I definitely don't want anything that requires mains power ...
The problem at the moment is the water is a lurid green. Does that mean I need to change the water? I don't think I could scoop just the green out...it seems like algae or something almost dissolved in the water.