Griophos

Griophos was a planet which was the home of a very nice swimming pool. When the Seventh Doctor and Melanie Bush realised that Paradise Towers had been kept in poor condition, the Doctor mentioned the pool on Griophos. Mel suggested that they go there, but the Doctor informed her that the pool was reserved for Gulmeri, a vicious species of flesh-eating octopi. (TV: Paradise Towers)