what is this? is the tank leaking or about to? in the darker spots in the silicone is water getting through? ive never seen this! help me 
pcfriedrich;1706659; said:that's why I like to use a substrate. you don't notice things like that. Of course, I'm the guy that turns up the radio when my car starts making strange sounds.
Used to be a reptile aquarium? was it made specifically for reptiles? tanks made specifically for reptiles aren't designed to contain water pressure. seems like you're okay, though. what size is the tank, and how thick is the glass?i_love_fish;1709110; said:the spots almost look gone so i have no idea what it is. it use to be a reptile aquarium though.