ralph, there are lots of issues like this
where many people get away with it so
there probably is not much of a problem.
many threads go argue over steel, copper,
salt, iodine, carbonate, wood in tank water.
so if you can't find another way to do
what you want, then use screws. but
if you can, with all the alternatives we
have offered, then maybe you should.
as aquaman points out, if you water change
often enough, it's really not even an issue.
but do you really want to depend on water
changes to maintain your tanks health?
I know I don't. which is why I don't over
stock my fish, I avoid potential toxins,
over spec my canister filter and under
feed my tank food and ferts. that way
my tank does not become a toxic waste
dump, should I miss some water changes.
