thank you all for your comments
Mellonman ,zQ. i am going to make 2 sets of shots of this tank,one with the vivipara trimmed and one with no vivipara ,as i think too that it might look nice without
Dave Spencer ,i am still looking for a way too make the gap in the center look larger but without moving the 2 main stones ,maybe i could do it by moving the stones in the first plan and by agencing well the plantation in that part ,i'm going to work on it
Phaturkey ,thank you for your comment ,those stones are sei-ryu-seki and sho-ryu-seki but not from ada cause those are too expensive .(it is much cheaper in japan to get the ones without the ada stamp ,which are exactly the same btw
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jazzlvr123 ,i totally agree with you ,i think too that an iwagumi should use a minimum of species of plants ,there are a few combinaisons that seems to work quite well ,keep them simple is a good way to soften the stone impact .
i fertilise with brighty-K only at this time ,3ml a day ,also use green gain ,green bacter ,phyton-git ,eca at each water changes (50L/week) ,my tank is at 25 degres (it is raising as the summer started here...) ,i am sorry i dont understand the meaning of wpg??
Re: 240L ada iwagumi 
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I not worthy!
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