help! cracked glass!!!

[gquimby1]

About to fill up my tank for a leak test and last night I noticed the bottom glass on the inside of the overflow has a small crack in it. Probably 2 in long. It does not go even a quarter of the way through the glass, as it is a 90 gallon tank so it's thick stuff. I poured a water bottle just in the overflow to see if it would leak and it didn't. Is there a certain type of silicone I need to buy to seal this? Or would just regular clear silicone do the trick?

Thanks guys

 

[gquimby1]

Also, unrelated but when I set up the new 90 gallon tank would it be okay to take water from my 29 gallon during water changes and dump it in there? I want to take a cup of sand and some cycled media as well. I only have four fish (smallish) and a few corals so there's not a big load to transfer but I want to do whatever tricks there are to avoid having two aquariums up at the same time for a long period of time. My wife might not enjoy that very long

 

[JohnnyRedd]

The bottom of the tank bears too much weight for silicone to do the trick. It may hold water and not go all the way through now but what about 3 months of weight bearing?

 

[mcgyvr]

to seal what? a scratch in the glass?
The silicone won't do a damn thing.. And if its a crack there is nothing stopping it from spreading further and dumping water on the floor..

Need clear pictures to properly diagnose BUT
The tank may be trash..

As to your second post.. No point in taking water (very little beneficial bacteria is free swimming in the water).. But adding sand/cycled media will help to bring over some bacteria/sand critters,etc....

 

[RogueGrown]

Personally, I'd give that tank to somebody that has a reptile. A new tank is much cheaper than a floor!!!

I tend to seed new tanks from old ones all the time, unless there is something wrong with another system then I just start from scratch.

Sent from my SM-N920P using Tapatalk

 

[ReefsandGeeks]

I hate to tell you, but there's no repair for cracked glass. You're gonna need a new tank. If the glass was scratched, that would most likely be no issue, but cracks are a whole different animal. It will propagate and you'll have 90 gallons of water and sand on the floor. And with Murphy's law, it'll happen either the day after you go on vacation, or when you're stuck at work.

Even if the tank holds water now, it's not trust worthy, even with a small crack, and IMO 2" is not small.

 

[Ron Reefman]

Like mcgyvr said, I would want to see the crack CLEARLY to make a serious diagnosis. My first instinct is it's a lizard tank now.

Does it have a bottom rim or is it rimless? If it's rimless the load is spread out more evenly over the entire bottom. You might consider pulling the bulkheads, get a new small piece of glass that will fit inside the overflow, and use 3M Co 5200 adhesive to glue it to the inside (BTW, use too much glue so it oozes out the edges). After it's cured (it takes 48 hours) you can drill the new gass and reinstall the bulkheads. And enen then I'd be shining a flashlight up at the overflow from under the stand to inspect the crack every week for 3 months at least!

 

[Sk8r]

My advice is 'spend the money now' rather than argue with your insurance company about a new floor.

 

[ssick92]

My advice is 'spend the money now' rather than argue with your insurance company about a new floor.

Well said. In my opinion the math is simple: cracked glass = buy new tank