Let me give you some pointers, now that you have suffered
Ceramic drill bits, cost a few$, slate floor 12x12 x 3/4" thick flooring, 1-2$ each or so. Some stainless steel 2-3" long 12 or 10 size screws.
Stack the slate and break to weigh the pieces down.
Take Cork, and cover the slate if you need to hide the slate weights(or any rock etc), realize that the cork will never sink and adds buoyancy.
"U" shaped 12-18 gauge wire works well for "nailing" the Anubias or other epiphytes to cork.
If you got fungi etc in the tank doing the Dry start method, you need to allow the tank some time to "air out", it was too sealed up.
Lower the water level also.
ADA aqua soil works very well as does mineralized soil or river/Delta clays/sediments.
Regards,
Tom Barr