Sorry, I havent really checked on the responses as I decided to just go with Ultimas since I couldnt get the steel at a price that was reasonable and im just gonna sell the 300.
IN REGARDS TO THE REPLYS!
Why 300 Gallon Sump
I have a 300 gallon tank thats holding them now, so it was more to repurpose and In the end i will be building a 15x15x4 so i would then be able to use that sump on that tank. Im thinking future here. I was planning on putting almost the whole thing as mechanical ( 3 rows of 3 filter socks ) filter floss, sponges, then biomedia and then putting closed loop ultimas for extra bio past the mechanical of the sump. All of this would be able to be used on the final setup.
Why Sump not behind or on side
In our current location the space requires the sump go underneath the tank, so putting it behind or on the side isnt possible. im building this to the exact space its going and at the end would be trashing the wood so Im trying to save money. I dont want to spend more than i need to as its a growout. I also dont need a foot of space under it. Right now i have around 6 under my 300 and its more than enough to pull out filter socks and change filter floss. When maintenance is needed everything can be moved out from under the tank and done in the open which is maybe once a year
Why 4 foot high
Im doing 4 foot BECAUSE the final tank will be 4 foot, so instead of buying multiple acrylic pieces ( 1 now and then 1 later ) I can buy for the final now and just move it over once we build our house, again, thinking future, I understand is not necessary now. Basically killing 2 birds
Cleaning at the hight
I keep bare bottom tanks, and would have been running 3 seperate outflows from 3 snapper darts so i was going to have almost 10 times turnover with filtration then i have quite a few pp20s. So cleaning the inside isnt really necessary. Water changes would all be done through a hard plumbed ball valve at the mid point on the tank. So theres very little need for me to get into this tank.
Reason for the grow out so large ( what fish )
I currently have my 300 overstocked in terms of fish in the space but have very heavy filtration ( 200 gallon sump )
Most of these fish are getting large and need a bigger home, but reason for the size im going as big as i am is because im being gifted an arapaima from a local keeper that is getting out of the hobby. He has 3 and im getting 1 of them.
( I have 2 gar, 3 arowana, 3 bass, 2 stingrays, 6 black bars, 10 red hooks, 2 datnoids, and 1 fire eel. So its definetly in need up an upgrade so i was trying to do it as cheap as possible since within 2 years they will be in their forever home. We just have to finish saving for the house. Its going to be build into the actually home so it will need to be finished at the same time as the home and inspected and cleared so it cant be a lengthy project. Because of this, i need to have at least 40000 ready to go when we start building.