i think they are stable..i bought the 2 inch 1000 pesos or 20 dollar for a 1 datnoid last may..and the other 3,4 inches about 10 dollars or 450 pesos last january..they cost nowadays.. i have also 1 rtc,1 shovell nose,1 delheizi,2 dragon fin,3 cl,5 ocellaris (said the petshop owner)2 tiger oscar,2 red oscar and a albino oscar..but sadly my siamese tiger just died last december...when my 110 gallon tank cracked..