Well i was in a situation like yours a few years ago..... i wanted a bigger tank... and being a little bit handy i took on the project myself... This post made me add pictures of my tank in the gallery...not to sure how to access them...lol...
My tank is just over 300gal. It actually holds about 25gal of water before it overflows out the doors... Its just a plywood tank, and the inside is covered in pond liner... pretty simple concept.. besides the angles, but a corner one i cant seem being to difficult. As for weight, i was very suprised it is quite light. 2 people can carry it easily. Now the tank comes off of the stand. so that obviously cuts the weight in half.
i had it with about 15gal of water in it in my 3rd floor apartment.
skipping to the cost, after all mistakes and such i made it costed me roughly $1000, but i bet i could make the same tank for cheaper now that ive done it.
Being you want about 90gal i dont think it would run over 500$, on top of that it will be one hell of alot nicer of a tank and stand, you have the pride that 'you built it' and you can design stufff for your needs.
Any other questions id be happy to answer.. i didnt want this post to be a novel.
p.s. i built that tank in a 3rd floor apartment... good ol' table saw just fit on the deck... boy did the neighbors hate me....
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