Once again thanks alot.., especially you Robertpope for taking the time to answer so many questions, it has cleared alot up for me, i cant do anything at the prescent about buying a new tank as all my funds are set a side for my walking and climbing weekend up Helvellyn in the lake district on the 18th April, so it will have to wait untill i get paid next, but serious guys THANKS ALOT..., also one more question...:- the little shubunkin i have in the round glass bowl awaiting its true home in the tank, i woke this morning to find a complete end to end around the top of the water line ..lots of little bubbles..which i have not seen before, what is this?