Fluval 1 internal filter too turbulent for 5G quarantine?

Hi,

Alas, all efforts to cure my poor gourami is not helping at all... and
now that I will start attempt using harsher chemicals that may be toxic
to other fish and plants (I was treating the whole tank assuming it is
contageous and bacterial and want to make sure all other fish won't
develop this problem), I am in the process of setting up a quarantine
tank and move the really sick gourami and another one that is
suspicious into it.

now, I have a 5G tank to use for quarantine.. everything is set up
except the filter (it's running without fish to stabilize temperature).
it has those air pump driven sponge filter, but it's so darn noisy
(when I first set up a q-tank for my danios, I had a cascading power
filter for the main tank so the buzzing noise wasn't all that
noticable.. but now I have a canister, so the buzzing noise of the pump
is permeating throughout the room..), I'm thinking about buying a small
interal filter to quiet it down.

I've been eyeing Fluval 1 internal filter for this... has rating of
50gph flow rate. is this too turbulent for quarantine tank? I can't
find any other internal filter that is of lower flow rate that would be
sufficient for a 5G tank... (Duetto has flow rate higher than Fluval
1, although the possibility of putting in carbon to filter out meds
occasionally might be useful.. but I guess in a Q-tank i'd just do lots
of water changes instead)

any thoughts?

linda