big tanks... anyone know max floor weight capacity?

vidiots - Sounds like you did a good job there... it wouldnt be too hard for me to reinforce the floor if I had an unfinished lower level, but its all finished. Not to say I couldnt do some re-modeling either but would definately get a contractors opinion before tearing up a finished room.

Native American - Thats interesting what you suggest. Hadnt thought about heating like that... I have noticed on my more cube shaped 45G tank with PC lighting it does run a few degrees over ambient. On my 75G though with DIY hood & lighting (used 2 ballasts designed for 4 tubes each (256W output total), overdriven into 4 tubes total, 2 venting fans), and an XP3 canister and couple powerheads, it does struggle to keep temp when the room is cool. It has either 2 200W heaters or 2 250W cant remember for sure now. For example the last few days I have had the back door off the house while remodeling the dining room. Its gotten pretty cool at night bringing the living room down to 66-68 degrees. My tank is set around 77-78 degrees and usually by morning if the room temp is down around 66-68 the tank has dropped down to about 74. I was worried because a couple fish I have are said to be sensative to temp fluctuatiuon more than 2 degrees, but they are ok. I have never seen this tank run higher than ambient when the room temp is actually over 77 though... usually theres a few hot days we forget to turn the ac on or something and its in the low 80's in the house when we come home, the tank might have risen slightly but usually still below ambient.

I do hear what your saying though, a bigger tank might be more effecient at retaining heat. If I try my best to keep the lower level warmer that will help too. But its still going to be around 10 degrees over ambient, even if I tried to keep the room at 70 which would be difficult thats still about 6-8 degrees to get to tropical temps. It be much easier if all my fish could live happy at 70* or less. Are acrylic tanks any better at insulating heat? I also plan on putting the tank atop a sheet of styrofoam as per manufacturer recomendation and was toying with the idea if I do an sump that I could build it out of a large cooler instead of glass. Not sure how much that would help. I could probably even insulate that back with styrofoam as well. BTW, I am thinking I might just end up with a 120G. I like the 24"Wx25"T profile, just the length I havent decided on... 48", 60", 72", or 96" for 120, 150, 180, 240 gallons. But the 120G tank still has the same weight per floor footage as 240... said another way, half the weight but also over half the number of floor joists.
 
I had a 55 gallon and a 20 gallon next to each other on a wood floor..The wood was breaking and giving away..If I left the tanks there, the whole wood floor would break and collapse, meaning, that the aquarium could have fell to the basement...I have a home built in the 1930s, all wood floors..I believe that where you position the tank and the quality of the wood plays a part in if a wood floor will hold or not..And 75 gallons is not too much weight..
 
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To further reduce the heat loss, you could put blue-foam insullation on the back of the tank, behind whatever you have as a background.
 
coupedefleur said:
To further reduce the heat loss, you could put blue-foam insullation on the back of the tank, behind whatever you have as a background.

Yeah, I was thinking the same thing.. actually I said it first lol

loaches r cool said:
I could probably even insulate that back with styrofoam as well.

But it was a long post I dont blame anyone for not reading the whole thing :p:

I was actually thinking maybe just painting the blue foam black and using that as the background.
 
loaches r cool said:
Its gotten pretty cool at night bringing the living room down to 66-68 degrees. My tank is set around 77-78 degrees and usually by morning if the room temp is down around 66-68 the tank has dropped down to about 74.
I think Aldous Huxley said it first (my paraphrase): Nothing like a beatiful hypothesis being slain by one inconvenient fact! (the fact being your big tank w/ mongo lighting, and it still cools off).

On the side of the background, you could paint the back of the tank, then attach the styrofoam insulation. I purchased a used tank w/ painted back, and it looks pretty good.

v/r, N-A
 
Just thought I would post an update here. I just recently aqcuired a 150G XH tank. I estimate it somewhere around 1600-1800 lbs fully loaded. But I also realised that were my 75G is now happens to be right over top of the main beam (three 2x10's) and also the steel jack sits underneath the tank. I am still wanting to get a professional look at it but I think I am good, especially with the steel jack underneath.

I also found some info about floor capacities for anyone interested: http://www.cichlid-forum.com/articles/aquarium_weight.php
 
vidiots said:
To reinforce those joists, what I did was get some 4x4s and stand them vertically beneath the floor joist and wedge them tightly into place between the joist and the cement basement floor. I then bolted the 4x4s in place. The tank is centered over the 2 floor joists on which it rests. There are 2 4x4s bracing each of the 2 joists. The 4x4s are not located at the corners of the tank, they are located at the "airy points" which are the points that most evenly support the weight stresses.

Hopefully this gives you some ideas.

Steel jack posts are the best method for this and I would also add, would be compliant with code - though that's not really an issue as you aren't using the 4x4's to support a structural part of the house, just a tank. However, at least you did something. :)
 
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watermelon said:
I had a 55 gallon and a 20 gallon next to each other on a wood floor..The wood was breaking and giving away..If I left the tanks there, the whole wood floor would break and collapse, meaning, that the aquarium could have fell to the basement...I have a home built in the 1930s, all wood floors..I believe that where you position the tank and the quality of the wood plays a part in if a wood floor will hold or not..And 75 gallons is not too much weight..

May have been on the floor sheathing/sub floor and not have been over any joists from the sound of it.
 
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