I decided to treat my fish to some spirulina tablet's i found on ebay ,i was chuffed at how fast they arrived and only cost me £2.10 i stupidly left them on the shelf under my tank .When i got back last nite i found one of my cat's had eaten all but 5 of them and then this morning i had to clean up the remain's of the spirulina of the floor after my dear cat had processed it (im trying to keep it clean) So quite an expensive cat treat in the end.And a pile of green sh**.