Gonna answer this one myself.
Due to lack of replies.
You can buy something called a Polyfilter that you can put in your tank & removes copper based chemicals (amongst others too) remaining from medications in your water.
Its best to cut strips off of it & place a strip in your filter.
Leave it in for a week or so.
It turns a different colour depending on which & how much of that chemical it has removed.
Keep placing strips of this in you filter until the colour of the filter shows upon inspection that the relevant chemical no longer resides in your water.
Good luck any one else with this similar problem.
Regards
E
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3ft X 2ft Tank & 2 Small Quarantene Tanks
1 pearl Gourami 1 Sword tail
4 Upside down Catfish 2 Flying Foxes
1 Angel 4 Corys
1 Horse Faced Loach 1 Rainbow Fish
2 Congo Tetra's 3 Dwarf Suckerfish
3 Lemon tetra's 3 Red Phantom Tetra's
I Bristlenose 4 BN Fry
Plants
3 Lilly's 3 Onion bulbs
3 various other plants
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