There is a running joke at the office where I worked last. A contractor calls up on the phone and asks, "How far will a 4 x 12 span?"
Everybody laughs.
It's because such a question has absolutely no answer without the restraints of context. It would be like saying how much butter can I put in a cookie without telling me how large the cookie is. How much salt should I put in the soup? . . . when I don't know the size of the pot.
People who are not Engineers ask engineering questions that cannot have proper answers. The most important part of engineering is the beginning where you frame the problem. Everything that precedes follows from those assumptions.
For instance it appears to me that you are using 1" pine boards. Is this the truth? It would definitely be an important consideration.
Not being there in person to look at your house I cannot say that any assumptions I might make it this point would be valid.
That tabletop you added is taking most of the load, but a little piece of unsupported load is going to be an eventual problem of seepage. You're slowly shearing the silicone.
Now what could become an immediate problem is if you had a small earthquake, or a large friend who drank up your beers and bumped into your aquarium.
This is where the catastrophic danger lies and if it involves a human being it could very easily involve physical injury.
What you have built can keep the load off the floor if it is undisturbed.
This is called unstable equilibrium.
I hope that sounds as scary to you as it truly is.
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