2 days ago I filled up my tank, and until now, it did not leak. 

I have to admit, that my attempt of sealing the tank was an failure and was caused by my lag of knowledge regarding mastering the silicone. Luckily for me, a friend of mine knows how that stuff works, and redid the sealing part, after I cleaned up the mess that I've made.

On Monday or Tuesday I will check the 40 year old Eheim filter and also the light. I also have two 50W heater, but I guess it is better…

Today I got the good old tank from my aunt and uncle. That baby was built in 1968 and was in service for about 7 years. At that time those tanks were hold together by an iron frame and cement to keep it leakproof. After all the time in shelf I think that there is a big chance, that it will leak.

After inspecting the tank, I figured out, I'll break the glass when I try to get it out off the tank. So I try to clean the messy work on the outside, and did a soft grinding on the iron frame…