Pics didn't show up for me, but if JK47 is right, the first is an acara that is a massive digger. Not a sand sifter, just a tank remodeler. LOL
Having said that, the second is not a geo, but will still sift through sand.
They get to be 12", so you could potentially house 4 of these guys in your 125, but I wouldn't recommend more and I would advise you to watch for conspecific aggression.
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Having said that, the second is not a geo, but will still sift through sand.
Sent from my iPad using MonsterAquariaNetwork app