Sorry to hear about your tanks, I'm struggling to deal with the heat too.
Was this in Hong Kong?
I wish... that alone could have made my trip
I spent a few days in Chengdu. Seemed like an up and coming town, semi modern but not to the degree of shanghai nor hong kong. Had a healthy population of sandle wearers hak'n up a storm of phlegm everywhere. I hardly saw anyone there wear shoes or sneakers. That aquarium street seemed to run 5-6 blocks. Would have liked to see what type of products and livestock they offered but it wasnt meant to be.
God, this heat is annoying, what have you been doing to fight it and better yet, what was your method of combat for while you where away? I'm going to Florida in a few days, and aside from not having my timers yet (they better get here like NOW) I have no idea what I can do to make sure my tanks don't get blistering hot.
Firstly, i moved all my prized livestock to the basement where space allowed. the ambient temp hovers around 70-74 there. totally awesome! What i didnt have room for that remained on the ground floor, i had my sister drop a few ice cubes into the tank when she came by each evening. I figured folks fed frozen repashy foods directly into the tank, it couldnt hurt. This seemed to keep my lower grade crystals going but there was noticible water evaporation, which was topped off with a brita filter. None of this was ideal but i had to work with what was available and easy to explain over the phone.
if possible, add more moss to fill the tank. Consider that insurance.
Get ready to see your plants flourish, while your shrimp numbers shrink... at least this is what i saw so far. i havent done a full inventory yet.
Consider lowering the light period. I cut back my 10 hours down to 6 which kept my plants growing fine while keeping the water temps lower. do a good cleaning on your power filters/heads so they last longer.