wow lotta big boys in that tank ..great looking fish but you are going to need a bigger tank for those puppys ..not trying to burst your bubble at all , your fish look healthy and happy but are going to for sure out grow that tank ...i would add a little substrate as well , at least for the bottom dwellers ,give em somewhere to call home ..it can also help your arow from getting drop eye by looking a his own reflection on the bottom glass , they say ....