yeah. cories when they are old are delicate enough. when they are young i suppose it's less of a chance of survival. certain things such as amonia increasing etc can be a pain but it happens. scrubbing the ornaments in the tank is fine. just brushing the bacteria off surfaces onto others. maybe kills some. washing in untreated water is a problem.
When you do your filter you should not clean the media inside the tank. you should get a bucket/ container that is big enough to hold your filter media with excess water(tank water). depending on your media it's different but with sponge like media it's easy. run it through your fingers, crease it up a bit, squeese it a bit in the water until it looks considerably cleaner. then put it back where it was. if they dont come clean properly replace one/ some (if there are two like mine). then dispose of that water and use the same amount of new treated water in the container. and put that in.(instead of the murky water).
Dan.
__________________ Thanks very much.
Hope I've Helped.  (19G uk) (23g in u.s) :3 bristlenose plecos,2 clown plecos  ,2 leopard corydoras (1M+1F)1 corydoras julii,2 clown loach,6 cardinal tetras,1 pregnant female guppy,2 cherry barbs (2Female)
Dan. |