Little update... Still working on cleaning the glass and making progress...
I'm trying two slightly different approaches for each of the tanks.
The "original" top tank I have sitting on its side in my living room and leveled as well as I can, and I have a pretty strong white vinegar/water mix I am pouring on and letting it soak in for several hours at a time before I go at it with the scrubby side of a sponge and some baking soda. This method is taking longer but still seems to be working.
The other tank, the "original" bottom one, I have outside on the original stand and I started leak testing it, so I decided, since I already had water in it, I might as well dump a bunch of white vinegar in and let it do its job. I started doing this when there was only 7-10" of water in, and after a day or so I drained some of the water after scrubbing the inside glass with the scrubby sponge, and after the water settled a bit you can already tell where the water level with white vinegar was (see a few inches above the water line
So after that, I decided to fill it up some more now to the ~60-70% fill, and dumped a bunch more white vinegar in and I'm letting it sit and every once in a while I go outside and scrub all of the sections of glass that are under water.
Cloudy from a combination of baking soda, hose water, and whatever debris is being removed by the scrubbing. I'm also removing some dirty water here and there and replacing it with more water/vinegar.
I also ordered some black 795 silicone as mentioned in the
PlantedTank thread, so I will use that to seal up the inside corners whenever I get them emptied out.
Something I have noticed is that it looks like someone may have re-siliconed at least one of these tanks in the past, because I can see it in the corners near the bottom especially where the slate is, and the corner (where the black is -- I guess this black stuff is the tar adhesive that was originally used):
So I may end up pulling this old silicone out and replace it with the 795. The tank outside doesn't seem to have had this done, as all of the glass to glass and glass to slate contacts are just bare glass to bare glass or bare slate.
Anyway, I guess this was more than a little update but figured I would share the progress
