Cecileew wrote:

Sorry, I just checked my records, Nitrate was at 5? It was zero
previously, with ammonia being a little higher. Now ammonia is hardly
present but Nitrate climbing. Is this an indication that my biological
filter is kicking in? Thanks!
Cecile

Yes, it sounds like you are most of the way through the cycle. Keep monitoring
and do water changes to control the levels. Streaks in the tail is an indication
of poor water quality (usually). White pooh could indeed be a bacterial
infection
have you got any medicated food? Medigold?