In my opinion, or rather preference, id love the outdoor/indoor pond with a viewing panel. The only down side for me is cleaning and just general maintenance. I cant help but feel extremely limited by glass tanks.
sir, how big of a tank or whats the gradual progression in the increase of the size of the tank are you proposing again sir?
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xleaning is no issue for me i dont do it simple
i started off with a 6x2 and run that for about 5 vyears but soon found you cant keep any large fish in a tank that size long term
i then got a 350g but found that was also to small it would last a few years but most tank busters will out grow it
what most people class as a big tank just wont last
i only have one cat a 28" tigrinus and please take into account thats a dwarf compaired to a rtc or tsn i have had him close to 8 years and it would be unfair to put him in anything smaller than a 8x4x3
big cats dont bend well like a aro which can turn on a dime
i have a 8ft long x 6ft wide x 3ft deep with a 6x2 sump and that is the bare min tank size i would put most of my fish in
cleaning haha i dont do it i have background on all three sides so just use a giant mag float to clean the front glass
i never clean the sand as the rays kick it up turning it over
water changes haha not done one by hand in 3.5 years its on a drip which pumps in 200 gal per day which over flows in the sump
when setting up any big tank you need to plan then plan again before starting
i setup my whole tank in about 3 weeks and that was building the hut its in look at this thread
http://www.fishforums.net/index.php?/topic/318731-1000-us-gal-project/
you may need to skip a few pages as its 50 pages long but it may give you some ideas
he's still learning about fishkeeping (4yrs now and he's learned ALOT since he never owned a tank before he met me).