I'm a bit stuck for ideas with our pond. Over winter we have lost about 4 fish. We used to have 14 goldfish a long time ago, now theres only 2 (and we have a sterlet which we never see - we were told this would clear our blanketweed etc). Some of the fish were getting quite big too! A couple we had for years, they were kept in an aquarium in the house, maybe 10 years old! (though i know this is pushing life expectancy, its odd that the majority died) What do we do with the remaining 2 fish? If the sterlet died, would it float to the surface? The "vegetation" is a type of grass, which goes absolutely wild in summer. We have to cut it back or its weight tips the pots over into the water. I'm wondering if it would be best to empty the pond, clean or replace the liner and start again, to rid the pond of any infections or diseases? Though I know this would spoil the micro-ecosystem, and the frogs are due any time. Also, I'm looking to get some more powerful filtration. Any recommendations? The current filter is an all-in-one UV and sponge and biological unit but it doesn't seem to be working very well. I have tried cleaning the quartz tube etc. I think its just undersized. At the moment its switched off. Whatever we do, I want to get some fine mesh to put over the pond, to stop birds (and maybe the frogs? we do get a bit overrun with them sometimes) - I found one fish laying on its side on the path, dead. Though it could have jumped out, I find this highly unlikely. The filter is in the box (didnt open it 'cos its full of spiders - dirty great big huge spiders with long legs and huge bodies): From above: You can see the location of the pump. The pond goes under the deck about a foot. One of the remaining fish: (there was a straw bale on the end of that string, dont know if its still here) Any advice and tips welcome!