It is 2 weeks since I dumped most of my dying plants, and bit the bullet and added Co2 with the remaining 4 healthy plants. This may or may not be relevant, but I mention it anyhow. Now I have an infestation of these small (about 1.5mm long) buggy things. What are they and how do I get rid of them please? I have some issues with the plants, but will post that in the plants forum.
Thanks, Elliott.

Or could they be snail eggs? I have 3 Zebra snails in the tank. Really hoping someone can shed some light.
Elliott

They do look like Nerite snail eggs, google nerite snail eggs and look on images to see if they look like yours, From what I can gather they need brackish water to hatch.

Thanks Chris, they match the pics on Google, and I also learnt that the snails I have are called Zebra Nerite snails! Every day is a school day!
Thanks again,
Elliott