If you are taking the plants out of the pond to fertilize them, any general purpose fertilizer will work. Try to find one with 'chelated iron' among the ingredients. You mention that you use Laguna sticks in your lillies; Laguna also sells a liquid fertilizer ( item # PT866 ) that would be ideal for your situation. You can even add it to the pond, but of course you will need more!
John
cheers for the info, ok I def. look into the fertilisers with 'chelated iron', also I recently bought http://www.tetra-service.net/tetra/...seite=6&group_id=1112&group_2_id=23&lang_id=2 this should work a bit as well but will def. look into the fertilisation off the pond for the floating plants.
I think it's the extremely clean pond that is causing the lack of nutrients I'm saying this because before this the pond was quite dirty with a very undersized filter system and we didn't like the looks of it, so in September I installed a OASE filter system with auto cleaning and it even came with a bottle of bacteria to start the filter, no complains about it it's an amazing filter I started the pond from scratch and there is no algae at all well just the normal bit of algae...