Hi all,
Although this is about an invert I think the problem is more beginner in nature.
I have had a blue lobster (species unknown) for about 5 months or so. More so lately, (but its sort of always been a problem) the tank really smells bad.
here is a pic for reference:

Water stats are fine, no ammonia/nitrite. I do water changes weekly about 20-30%. often i will do it more often due to the smell. He is in a 10 gallon tank, with regular gravel and a rock cave. There is also an airstone.
Here are things i know are not the problem:
overfeeding: I feed him an algae wafer 3x a week. I used to provide feeder goldfish but they really dirtied the tank so i stopped that. I gave him one about a month ago but none since
dirty tank. I vaccum the gravel regularly. One LFS employee suggested decaying fish bits, snails etc. I have found none. Since the tank doesnt get any light, there is little algae but i scrape that as needed.
Decaying food under the lip oif the hood. Nope
inadaquate filtration: No way!
I have 3 filters a whisper 10i intank, a whisper power filter and an aquaclear 20.
so the water is usually clear and everything is ok except the smell but i came home to this fiasco:

what the HELL IS THAT???
ok guys, my girlfriend is on the verge of making me get rid of him so I need help..
Also why isnt he blue since molting?
Although this is about an invert I think the problem is more beginner in nature.
I have had a blue lobster (species unknown) for about 5 months or so. More so lately, (but its sort of always been a problem) the tank really smells bad.
here is a pic for reference:

Water stats are fine, no ammonia/nitrite. I do water changes weekly about 20-30%. often i will do it more often due to the smell. He is in a 10 gallon tank, with regular gravel and a rock cave. There is also an airstone.
Here are things i know are not the problem:
overfeeding: I feed him an algae wafer 3x a week. I used to provide feeder goldfish but they really dirtied the tank so i stopped that. I gave him one about a month ago but none since
dirty tank. I vaccum the gravel regularly. One LFS employee suggested decaying fish bits, snails etc. I have found none. Since the tank doesnt get any light, there is little algae but i scrape that as needed.
Decaying food under the lip oif the hood. Nope
inadaquate filtration: No way!
so the water is usually clear and everything is ok except the smell but i came home to this fiasco:

what the HELL IS THAT???
ok guys, my girlfriend is on the verge of making me get rid of him so I need help..
Also why isnt he blue since molting?