
I have had him/her 15 months now, has been in the 90 litre for 11 months, it's just since the family went in that he has started hiding like this ( it's 2 days now. I used to see him everyday).
I feel awful - poor thing, he was quite happy before

Do you think it is a good idea to clean the tank, or should I just leave him ? It could really do with a bit of a clean, but if I do the filters (and they need it this week ideally - at a push could leave it until next) if he is behind them it will disturb him.