We've just bought a new Fluval gravel cleaner for about £16. Wish I'd thought of the DIY money saving solution! Normally we use that (or the old cheap one we had) to siphon water into a bucket and carry that bucket away. Refilling buckets next to the tank is a good idea though. Normally we don't wait 5 minutes for the dechlorinator though, usually put it in, fill the bucket to right temperature and pour the bucket in when full. That's assuming the dechlorinator has done the job with all the water mixing when the bucket fills.
I'll still treat all the fish then in that case, wasn't sure if it's worth doing after the death of the molly.
Are there any gouramis that can live in a peaceful tank? I would have put dwarf gourami down as being an option, but not sure what else. I know my parents had a kissing gourami with community fish decades ago and they seemed to get along. Would a female betta fish work with tetras? Previously avoided them as I hear they don't play nice with colourful guppies - which won't be an issue in the new setup.
I'll still treat all the fish then in that case, wasn't sure if it's worth doing after the death of the molly.
Are there any gouramis that can live in a peaceful tank? I would have put dwarf gourami down as being an option, but not sure what else. I know my parents had a kissing gourami with community fish decades ago and they seemed to get along. Would a female betta fish work with tetras? Previously avoided them as I hear they don't play nice with colourful guppies - which won't be an issue in the new setup.