The Begin or End real Tank for Coleus

[Coleus]

Update: , got the sump in place. I put it right on the floor an fill up with water for leak test



There is no leak but I noticed there are white line underneath the tank (not line from concrete)



So should i place the sump on ply wood and level it? All level are within the middle lines of level right now. Also anyone know what those lines are? i put my hand in tank to see if these are cracks and they are not. They Looks similar to mark when you bend a piece of acrylic