Join Date: Jul 2015
Location: North America, eh?
I have the sameish problem, it's the joy of fish. Goldfish do poop more, so expect more odor from them. I find fake planted tanks with carbon have next to no scent, but my planted one didn't smell very good after I removed the carbon. Here's some things that make fish smelly and stuff that gets rid of the smell.
Live plants, if the plant is going through a melt its gonna be nasty.
Dirtied tank, my mistake was assuming it would smell fine.
Large bioload fish, my snail made my tank smell a good deal worse.
Driftwood, I had some that wasn't sturdy, mistake again.
Fertilizers, after adding my fertilizer my room smells like flourish.
Carbon, stops bacteria blooms, stops algae if its a new tank, pretty much all nasties.
Fake plants, not silk, plastic, my tank was so nice smelling before I went live.
Very clean gravel
Clean everything. Leave only the basics (filter, decor, light, heater, water, plants) if you really don't want smell.
This is only off my experiences.
Mufasa, Aslan, Cheshire and Bagheera
SIP to all my girls and boys who fought till the end