Hi Guys ,
Glad to see another father son team on the forums .[ some day he may know more than you , Jon ].
Well I found out the hard way about these guys and my peacock gudgeons

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Will you be keeping all 4 ? [ as individuals they are so timid , breeding pairs are another story ]
They'll do do fine in that water ,maintenance is the key [ water changes ]
egg hatching may prove difficult , but I don't think impossible .
Blue/gold/opaline Gouramis [three spots and opaline are the same species] you'll most likely only be able to have 1 [ aggression between them is deadly at times ], but 1 may work , and believe it or not
may bully your Curvies

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Cardinals may work , never kept them .
I like harlequin rasboras myself .
Cories too

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The tank should be big enough for 2 pair , I breeding happens other fish will be chased , or worse in my case
If you set it up in the hopes they'll take opposite ends of the tank with an open area to the center it could work .
But it's going to be their choice .
Plenty of plants / rocks and areas to retreats are good to have .
