Thanks everyone. I fed them some blood worm last night. They both gorged it and didd not attempt to harm each other. The funny ting was that when I put the filter back on, they went frantic and hid, then came out again once I had turned it off. Paramesotritons which don't like current?! Why do I get the odd ones; I once had an adult spotted net(N. Viridicens) which was terrified of water! Should I try leaving the filter off. It is a Fluval Biolife, so it isnt that powerful. For the moment ive directed the deflector upwards, so less current. They are not full grown, Henk, so I should not think they would be territorial yet. After the feed last night with no current, the thinner one looks much fatter.