Sounds like a recipe for spills.
hahaha... you couldn't move that tank with your vehicle ***a LITTLE exaggeration, but you get the point***... the glass and seems are thick as is the trim also... trust me... my bucket isn't going anywhere!!! not one spill in the years this tank has been up due to the bucket on top. can't say that about most other things, though. with the kids playing around it, knocking into the tank while it's filling, etc., i'd say it's safe to say it's a pretty solid spot... aside from the fact they can't reach it....
I just did the cold water thing tonight and starting to think it killed my two largest Keyholes. They are the only ones that seem affected but they were swimming upside down and laying flat on their sides. Right now they are laying around barely breathing.
cool NOT
cold... add the water
sloooooowly the first few times... increase the speed you fill the tank back up over the course of several w/c's... etc., etc. ... but you should still be matching the water temp as well as you can, imo. ... the reason i posted up at all about that, is that micha COULD turn the temp down a little and fill a little slower without having to worry about frying fish in their own little heavenly puddle. if the temp is uneven, it's best to be a
little cool instead of a lot hot....
just because someone else says they did it doesn't mean you don't have to be careful. i use airline tubing for a siphon to the tank sometimes... and it's a 50 gal. if the water's real cold and i'm in a rush, i'll siphon with a 1/2 id hose and add an extra 450 watts of heaters by the filter intakes and monitor. once the temp starts getting ~2 degrees off ambient i slow things down immediately.
surely other folks who do the same do it entirely differently. you'll have to find what works for you if you're going to try again... but be sure to keep a keen eye on things until you know how your fish react.
now, if your temps are pushing the limit on the low end for your species, obviously this wouldn't be the brightest thing to try. it's all relative to the person and tank in question as is almost everything in this hobby.
sorry about your luck. hope all turns out well. please don't mind my random jotted thoughts.