The first thing I did once I found out that I would be receiving a free 125g tank from a friend's family was to mark out the footprint of the tank in the office so that I could see where it would fit and so that when we moved the furniture into the house that we wouldn't put things where the tank was going. I actually moved the tank to the adjacent wall than what this photo shows.
The tank is 6' long by 18" deep by 2' tall
I wish I had taken some pictures of the tank when it came in because it had been sitting outside for an extended period of time and was full of cobwebs, dirt, leaves, and four dead mice. I spent an entire day with a shop-vac and hot-vinegar water cleaning and sterilizing the tank which a bit hard when you cant use any chemicals. Eventually I got the behemoth cleaned and hoisted on top of the stand. Regardless of how dirty this tank was I am very grateful to the Dorman family for giving me a free tank of this size.
All cleaned and set up
I decided to build this tank on the cheap because, well we had just racked up some serious debt buying a house, so I went to the hardware store and bought 200lbs of playground sand (almost identical to your standard aquarium sand but 1/4 the price). The thing about playground sand, however, is that they do not rinse it at all so if you're like me and you just dump it into the tank with washing it be prepared for your tank to look like garage for the next month.
Sand freshly added. Its a 6' box of mud.
My plan for doing this tank up cheap kind of failed. The plan was to use only cheap materials and reuse equipment that I had in the basement that has accumulated over the past three years and four tanks that I've owned. Well, I used my old dome lights from the 55g planted, my Eheim-Jager 250w, and Aqueon Pro 150w heaters but that was it. I was going to throw my Eheim ECCO 2236 filter on the tank but I ended up impulse buying an AquaTop CF-400UV canister filter and at the same time I bought $150 dollars worth of driftwood. Way to not spend any money.
Full Tank Shot one week after being set up, still murky from all the silt.
Eventually [after two 50% water changes] the tank cleared up. After being allowed to cycle for a month, I purchased two Oscars (Astronotus ocellatus) from my LFS. I got one Red oscar that is now named Samson and the other is a Tiger oscar named Delilah. I actually have no idea as to the sex of either fish since Oscars are notorious for not showing sexually dimorphic characteristics until at least 10" in size.
Samson and Delilah enjoying their new home.
The tank has now been running for about 2 months, The oscars are doing great and growing quickly. I recently added a small school of Silver Dollar fish to the tank to reduce aggression between the Os since the smaller Delilah's tail was starting to get very ragged. I also planted a large Amazon Sword in the tank but the Silver Dollars have pretty much eaten it to the roots now. Oh well.
Amazon sword and CO2 diffuser. Neither are there anymore.