Yes, looks like the gaps are getting close to the seam. The blackish is algae I have a couple spots in one of my aquariums which have a little way to go yet, but resealing will need to happen eventually.
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 New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?
 Start here - Aquarium Advice Article
https://www.aquariumadvice.com/guide...ater-aquarium/
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves
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