You can get some at your pet store, but, at my store at least, it's ten dollars for a small tube. What I always do is just go to Lowes or Walmart and buy a tube of Silicone I for like 5 dollars. The important thing here is to get Silicone I, not Silicone II. II has an anti-mold agent that over time will kill your plants and fish, but I is just straight up silicone with no toxic additives. I'd say be careful and read the label too to make sure you're getting clear or white or black just because its frustrating to have the wrong color if it's going to be somewhere visible. Also, I recently found out you can safely use super glue in your aquarium.
It sounds like you used Silicone II if it made your fish sick, but here's a fun fact about that. If you soak whatever you glued together with II in water long enough, you'll be able to leach the toxins out and make it safe. Not knowing what I was doing, I resealed my 55 with II and killed a few fish. Once I realized what I did I left it full of water for months and did weekly water changes, and once algae started growing I figured the toxins were gone. I wouldn't recommend this since I don't know of a way to know for sure when its not toxic anymore, but fish still live healthy lives in that tank to this day, so it is possible.
It sounds like you used Silicone II if it made your fish sick, but here's a fun fact about that. If you soak whatever you glued together with II in water long enough, you'll be able to leach the toxins out and make it safe. Not knowing what I was doing, I resealed my 55 with II and killed a few fish. Once I realized what I did I left it full of water for months and did weekly water changes, and once algae started growing I figured the toxins were gone. I wouldn't recommend this since I don't know of a way to know for sure when its not toxic anymore, but fish still live healthy lives in that tank to this day, so it is possible.
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Gonna pick it up tomorrow after work.
