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Sunken Deep Tanks Rebuilt

Ok, thanks for all the information! I think there might be a bug or something, then. I just started the fourth scenario for Freshwater Frenzy, where you start at Prestige Level 8. The Sunken Deep Wall tank is available in my science projects to be researched (so I don't have access to it), but I do have access to the Sunken Deep Corner Tank and Sunken Deep Observer Tank right away, so they are apparently not being gated by having researched the Sunken Deep Wall Tank. So it seems like the unlock-gating might not be working properly? I don't mind that being the setup or anything, it just seems like a bug based on what you've said.

"sunken_wall_1side_deep":"Sunken Deep Wall Tank",
"unlockable":{
"number":1,
"type":"Science",
"availableLevel":4,
"category":"exhibit",
"unlockTags":["2deeptank"],
},

"sunken_tank_wall_2side_deep":"Sunken Deep Corner Tank",
"unlockable":{
"unlockedBy":"2deeptank",
},

"sunken_tank_wall_3side_deep":"Sunken Deep Observer Tank",
"unlockable":{
"unlockedBy":"2deeptank",
},

"sunken_tank_wall_outcrop_deep":"Sunken Deep Outcrop Tank",
"unlockable":{
"number":1,
"type":"Science",
"availableLevel":7,
"category":"exhibit"
},

"I'm curious though, why does only one of them need to be researched?"
No particular reason. These 4 tanks were just copies of the original and then substituting to make them "sunken".
So whatever they had as unlocking carried over.

However, if you wish to change things for your game play, here are the 4 tanks in the mod and their unlock info you could change:
(Note that the game no longer uses "number" or "category").
IIRC, "Sunken Deep Wall Tank" unlocks at level 4 and that unlocks the next 2 tanks (via "2deeptank" unlocktag).
The last at Level 7.

These are great for having high-volume tanks in small-area footprints.

I'm curious though, why does only one of them need to be researched? (I think it's the Deep Sunken Wall Tank, it needs to be researched when the others are automatically available.)

thanks gary.methvin. Means I missed a correct height in the containers (your fish probably don't swim to the bottom either).
Easy enough fix. Ver 1.10 should fix it.

This tank is exactly what I was hoping for! However when placing decorations, they appear to be "floating" mid tank (floor level where they would be placed in a non-sunken tank)