75 Gallons is fine as long as its not too thin on the width, many 75 gallons are super thin and hella high. Some height is great for many morelia, but they will benefit from a deep cage with good floor size as well.
Keep in mind that aquariums are harder to maintain at proper humidity for many snake species, so ensure you have a good hygrometer to measure this as well as your ambient temperatures. Glass thanks can be hard to create those perfect environments temperature and humidity wise when they are that large. So as long as you know that. Then yes. However, if you have not bought the enclosure YET, may I rec you look into a similarly sized vision cage ;-)
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Retics are my passion. Just ask.
Re: Is a 75 gallon good enough for a carpet python
A 75E aquarium is 48x18x21 roughly. Floor space is nice in a 75E. I think plain 75 gallon tanks are rare or at least they are for my area.
So if you go with the PVC cage suggestion of your liking, you'll want to be around those parameters. A 48x24x21+ will give you awesome floor space and height.
-Yar
1.0.0 Albino Black Rat snake(Wafer)
0.0.1 California King snake(Oreo)
0.0.1 African Housesnake(Cupcake)
0.0.1 Honduran Milk snake(Blackjack)
0.0.2 Normal BP(Petey; Twix)
0.0.1 Yellow Rat Snake(Dijon)
0.0.1 Madagascar Speckled Hognose(Granola)[RIP]
1.0.0 Albino Nelson's Milk snake(Candy Cane)
1.0.0 Lesser BP(Creme Brulee)
1.0.0 Mojo BP(Brownie)
0.1.0 Black Motley Corn snake(Anisette)
0.0.1 Pueblan Milk snake[Fostering, Taco Grande]
0.1.0 West African Mud Turtle(Bulger)
0.2.0 Red Eared Slider(Squirtle, Turtwig)
1.0.0 Rat Terrorier(Ranger)
It depends in the dimensions. If it is the size as mentioned above it would be close but a little small. A 4 foot long by 2 foot wide tank would be better.