We had 2 BTAs that started looking pretty shrunken about a week ago and didn’t perk back up within a couple days so I tested the water (alk-6.1, calc-426, ph-8.5, salt 1.023). Had always used Reef Fusion to bring levels up before but never seen alk so low so decided to try more drastic measures. Read up on baking soda dosing here on R2R and used BRS calculator to figure out dosage. Suggestion was .92 tsp for 20 gal tank, but I didn’t want to bring it up too fast so I put a bit less than .5 tsp two nights ago and ditto last night. Today one BTA died and the other looks near death (see pics). Water test today is alk-8.2, calc-407, ph-8.2, salt-1.025. My questions are: 1) did I do something wrong with the baking soda or is it more likely they were just too far gone due to low alk or some other cause, 2) is there any chance the BTA in the pic will make it or is it about to pollute the tank(seems to be gripping better since I put it in seclusion pod, but mouth is gaping and it looks like it may have already spit out it’s organs if I’m identifying those brown bits correctly)? Add’l info: this BTA has come back from near death twice before - once when we evacuated from Hurricane Ida and again in January when it split (the clone looked like it was not going to make it but did eventually recover). It’s the mother that died this morning and the clone that’s still barely alive. Both of them started moving around in the last couple days like they were trying to relocate, but then just kind of stopped being able to cling to the rock. The rocks have a lot of green algae on them, but that never seemed to bother them before. Have been experiencing salinity swings due to unpredictable evaporation (likely from this heat wave we’re in), but stays b/n 1.023-1.026. The rest of the tank does not seem to be experiencing any changes (2 clown fish, 2 hermit crabs & a coral [coral has never thrived]). Any advice is appreciated!