If the coral can be moved, then the best thing would be a specialist coral dip used in a bucket outside the tank or a freshwater dip. If the coral can't be moved and you have room for another fish then you could try a sixline wrasse or banana wrasse but theres no guarantee they'll eat them. I've got some coral dip somewhere, will have a look, can't remember the brand offhand, but it was very good at getting rid of zoanthid eating nudi's so should work on flatworms. HTH
That looks very professional Eagle hope it solves your nitrate problem. If you want some bio-balls I've got a couple of carrier bags full doing nothing, they are used but should be OK if you boil them (will they melt ) Let me know if you want me to post them/some/all.
This is one of my cats, "Becks", after one of his twice yearly haircuts. He's very gentle and loving untill he sees the grooming brush coming, then all hell breaks loose. He sulks for at least 2 weeks afterwards and sits with his back towards everyone, BLESSSSSS
My next door neighbour who moved in during the summer is a soldier but he's always at home. Anyway turns out he's AWOL and has been for months, how do you know?, you may ask. Well a few days ago three big brutes turned up and started hammering on his doors while I was putting out washing, they were scary looking so I went inside. They knew he was inside because his big 4x4 was parked outside the house. After they got no response they came to my house and said sorry for frightening me and showed me their MP ID's and explained why they had come. I just thought they were bailiffs or something. After they'd gone he waited in the house for a couple more hours then got in the car and drove off, they haven't been back since. Surely he's not getting paid while he's AWOL and I don't think he'd get dole so got no idea how he manages to run his big gas guzzler and home.