I just put my new three inch blue gourami into my ten gallon along with a bunch of plants. The aq is 3 ppt salinity and it's fairly hard water.
Can my gourami be happy here? He seems to like it I think
should be fine as long as the temperature is above 84 and he's got lots of ick-infested guppies to eat.
but make sure you have some plants so the guppies can hide and he won't eat them all at once. Maybe a nice blue spruce.
if you have any more questions, blease make another thread for each one.