Dumbest thing I have done is start a reef tank on a whim. No proper planning! I started the research only after I bought the tank and added the water, rock, and my first two fish (one of which is miraculously still alive and well 18 months later).
I bought a used tank and cabinet through FB marketplace. Started with a canister filter rather than getting a ore drilled tank and sump.
Bought cheap lights and expected a miracle lol.
Then my dummy self decided I don’t want carpet anymore and I switched to a hardwood floor. So that meant taking the tank down (and I just finally got it cycled and healthy), saving the water/fish/rock in Lowe’s buckets. Put the tank back up and of course trouble followed.
couple months later Petco has a 75g for $75 that I couldn’t pass up. So weswitched the reef to the new tank.
Then my HOB protein skimmer decided to leak which caused the cheap cabinet to warp real bad and cause my tank to be almost an inch off level

Soooo…my son built me this fantastically strong stand for my tank which also allows me to now add the sump underneath, which I couldn’t do before.
Morale of the story??? Plan ahead lol
I’ve learned. Take my time and stop rushing or making changes on a whim. Made it hard on myself for sure.