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Well I have made some progress on the build. The walking platform is being painted along with the tanks. I have one more coat of pond shield to apply on the 720gallon tank. The walking platform is upside-down so I can paint the bottom. I have been remodeling 2 bathrooms since January but with those projects completed I can focus on the aquarium again. The electrical has been pushed in place as well 12 outlets over each tank split on 2 circuits. I also just purchased a used 150gallon tank that will be the refuge tank. I hope to get more work done in the next week or two that will show some progress in the pictures.
Easy answer is chemicals. When wood is treated a lot of extra chemicals are used to prevent the wood from rotting. Many of those chemicals are toxic to marine animals. Formaldehyde for instance is used in some plywood's. The stuff I purchased was from Home Depot from the company Columbia Forest products uses a Formaldehyde free process for laminating. The paint on the outside and the pond shield inside will be providing more than enough waterproofing.Why not use marine plywood or waterproof plywood think they are the same?.
Excellent , Thank you for your reply some nice research there. Best of luck with the build looking good.Easy answer is chemicals. When wood is treated a lot of extra chemicals are used to prevent the wood from rotting. Many of those chemicals are toxic to marine animals. Formaldehyde for instance is used in some plywood's. The stuff I purchased was from Home Depot from the company Columbia Forest products uses a Formaldehyde free process for laminating. The paint on the outside and the pond shield inside will be providing more than enough waterproofing.
I not to worried about cleaning. What ever grows on the back and sides of the tank will be left alone for the most part. I plan to keep the lighting more in the center of the tank and give a bit of a shadow affect to the back of the tanks. I will only be concerned with cleaning the front glass. I did a bit a research on waterproofing and after seeing the DIY king on youtube use pond shield for a plywood build I was more or less sold. The product is intended to be used in aquariums and is not too difficult to work with. Getting a coat on the big tank is a bit of a challenge because it is so large and the pot life is about 30-45 minutes before it starts to become difficult to work with. I am planning one more coat for the 720 gallon tank and it will be finished then I just need to make the top bracing up so it is ready to be attached after the glass is installed. The glass is what I am dreading as it is going to be a big job.I've never thought about using pond shield in an aquarium. Do you think it'll be easy to clean? What are you plans with that?
So the corners were all doubled up along with the bottom. Here are some cut away and a exploded views of how all the corner joints are put together. Perpendicular screws and wood glue hold it together.This is awesome! I started a plywood a few years ago, but it just never got finished and tore apart. Maybe someday.
You said you doubled the plywood, but nothing about bracing the corners.