Reservoir /pond for a waterfall

[DTM62]

What would I line it with pain seal with Drylok work and hold the water and could I build a styrofoam box Forts and make that the pond??
[automerge]1625257080[/automerge]
I ended up using dry lock for the pond, 4 coats. Styrofoam shell working well
First pic is the enclosure 80×22.5×22.5 1/4 in. Tempered glass. Second pic.background.3rd teeth and rest of finished . black light w/ neon paint. Looks great and Eve absolutely loves it. Swimming around in pond with in 1 HR.I was afraid enclosure was to big for her.she is 5 1/2 months old and 30 inches long. Butt in she love her new home.. All made from materials from job sites.
[automerge]1625257160[/automerge]

What would I line it with pain seal with Drylok work and hold the water and could I build a styrofoam box Forts and make that the pond??
[automerge]1625257080[/automerge]
I ended up using dry lock for the pond, 4 coats. Styrofoam shell working well
First pic is the enclosure 80×22.5×22.5 1/4 in. Tempered glass. Second pic.background.3rd teeth and rest of finished . black light w/ neon paint. Looks great and Eve absolutely loves it. Swimming around in pond with in 1 HR.I was afraid enclosure was to big for her.she is 5 1/2 months old and 30 inches long. Butt in she love her new home.. All made from materials from job sites.