Thanks Waterdrop... feeling better after reading your post 
I've been fairly good at doing water changes on my biorb, the longest I've ever left it without a change was two weeks, so I'm not too concerned now about OTS, I'll keep doing the water changes until the results are prefect! and will then check more regularly to make sure they don't get out of hand again. Hopefully my larger tank will cycle soon and they can all be swimming in their beautiful new surrondings.
I've been fairly good at doing water changes on my biorb, the longest I've ever left it without a change was two weeks, so I'm not too concerned now about OTS, I'll keep doing the water changes until the results are prefect! and will then check more regularly to make sure they don't get out of hand again. Hopefully my larger tank will cycle soon and they can all be swimming in their beautiful new surrondings.