5 Gallon Tank Bleaching Old Tank (5gal)

Eelectric

Hi there! I recently bleached my old Marineland Portrait 5 gal tank. I kept a betta and snail for almost 2 years until they caught a nasty bacterial infection and passed. Even after the bleach, I can still see what looks like dried sludge on the sides of the glass, and deep in the filter component. I can't reach certain spots and I'm worried any dormant bacteria will reanimate once I restock the tank. I was planning on bleaching again to avoid contamination. Is there anything else I can do? I really want to reuse this tank for neocaridina shrimp.

Dimensions of the tank are: 9.63 x 9.63 x 17.03 (LxWxH)

The 2nd photo is hard to see but it looks like dark, dried, spotted sludge.
 

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SM1199

Any type of stuck-on grime can just be scrubbed off with an old toothbrush and rinsed with tap water. The first bleach cleaning would have been more than enough to wipe out any harmful bacteria, but it doesn't necessarily lift off the grime on its own. If you're really paranoid and decide to do another bleaching after scrubbing it off, just make sure you rinse it out well and use an adequate amount of dechlorinator once you do fill it back up.
 

Eelectric

Any type of stuck-on grime can just be scrubbed off with an old toothbrush and rinsed with tap water. The first bleach cleaning would have been more than enough to wipe out any harmful bacteria, but it doesn't necessarily lift off the grime on its own. If you're really paranoid and decide to do another bleaching after scrubbing it off, just make sure you rinse it out well and use an adequate amount of dechlorinator once you do fill it back up.
Thank you! I did just this and the tank is running just fine! The water is crystal clear and no sign of bacterial blooms. Now on to cycling :eek:
 

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