Did you drip acclimate the new fish? May the old fish grew with the tank and it is just too much for the noobies. I would hate to think that you can't buy new fish.
BTW, it looks like if you were to ship me some of those plants, your fish would think you were really cool! LOL
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Trying to breed GBR (standard and high fin), Discus, Angels, and currently breeding 6 types of guppies, 5 types of swords, 2 types of mollies, and RCS.