Welcome lmorandini!
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1) I've been told undersea visibility is rather poor in Victoria (10-20m on a good day): is really that bad or it changes with the spot you're diving ?
20 metres is a *very* good day. Some times its up to 30, but generally when its 10-15 its considered quite good. Its certainly not tropical waters. If the viz is less than 5-8 metres then I generally head back in and try and find somewhere else to go, or give up and wait for better conditions
, but that's probably because I haven't really ever dived anywhere "better". Ignorance is bliss.
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2) Water is colder than in the Med... hence I suppose a 7mm wetsuit is needed (currently I use a 5mm, but I dive during Summertime), could you confirm ?
Much colder. In summer the water temp hovers at about 22 degrees in the bay, a little colder outside. During winter it can get down to below 10. In summer a 3mm steamer is fine for me, and even during the depths of winter I use a 5mm steamer with a .5mm neoprene / metallic thermal vest. Still a little bit chilly but I could stay in the water for 2 hours without much trouble. (Ive got a bit of meat on me though).
This site
http://www.baywx.com/temps.html has historical average temperature graphs for ppb - you might find it useful.
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3) How much a, built-to-order, pure neoprene (no cloth lining) wetsuit may cost in Melbourne ?
Custom? Not sure. You can get very good quality 5mm Neoprene steamers for $250 AUD (about 200 euro - Probe brand - very comfortable suit). 7mm's jump up a bit in price, and then when you start playing with things like semi drys it goes up even more.
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4) Is it standard practice for swimming pools to forbid the use of long fins (mine are Falcon C4), or you are allowed to wear them during off-peak hours ?
Not 100% sure. Its fairly common for scuba schools to rent out lanes in swimming pools for training, and Im sure if you sweet talked the clerks they might let you in. I suspect that you would have to do it during the quiet times though.
Welcome to Aus!