We turned the light off yesterday – well, I did, in a fit of pique and an effort to reduce our chronic algae issues (iss-ues). I’m sick of the disgusting matting effect over the gravel and the plants, and I’ve heard that this can help. So we’ll see. As yet we haven’t covered it up to hide it from the daylight; thought we’d try this first. James thinks it might be getting more light now than it used to, and that might explain why it’s there.