I have a divided betta tank and both have got velvet which I think some snails brought with them. I currently treating them and it seems to be working for one betta great while the other seems lethargic, slowed breathing, and struggles to keep near the top. I think it may be the medicine but it looks to be reducing the velvet but at the cost bettas health too. I lowered the water levels in hopes of making able to get to the surface easier and remove some medicine. Was this the right move? The medicine is kordon rapid cure ich disease treatment, it says its quick relief for ich and protozoan parasites. I chose this as it's the only medicine I could find in my area besides some type of tetra all around medicine stuff. I know copper based medication is better but I've yet to find any here.