Jonathan’s (the op) tank is 750 mm deep and the tanks you have linked are run by professionals. So I would say he has a challenge on his hands.
Valid points but I always feel the issue with deeper tanks is light penetration to substrate level AND water movement through the entire depth of the water column
“Professional” assisted tanks at 90cm - 100 cm are not that unusual - again there are some on FO’s Facebook & Youtube pages, gleaning filtration, lighting, plant details is easy enough & I think useful information
While professional aquascapers have a decided experience advantage, George Farmer has shown in recent videos that first timers can maintain a tank & grow stunnng plants just by following protocols
Where many first timers run into difficulty is by picking & choosing bits of lore here & there & writing their own methodology (& gentle suggestions to follow, for example, ADA
or EI until they have some understanding of plants is turned aside) ... which is all fine, experience is the best teacher
😉
lighting 2x 54watt t5 tubes and 46watt fluvel 2.0 planting led uni
Best quality HOT5 and reflectors might deliver moderate PAR at that substrate depth
LED - need minimum 1watt LED, 3watt is much better AND need good internal reflectors & diffusers, also better quality LED rather than knockoffs
AI Prime freshwater would manage nicely (90 degree lens as I recall so much better depth penetration than 120 degree lens BUT less area of light distribution)
Given your present lights, I’d establish MC carpet with dry start method, then gradually increase water level over several weeks
Aquario Neo diffuser kit with yeast CO2 would be worth the investment I suspect as well (I’d buy 2 kits)
Marsilea carpet might or more feasible long term but this is slow (especially compared to MC) so I’d still establish with higher light (ie don’t fill the tank past 45cm above substrate)& CO2 initially
You could do a mixed MC, Marsilae carpet, expecting the latter to predominate over time