Unlike Oto, Goby will eat anything. If you see goby cruises around during feeding them that means they were eating the flake food. If Gobies are full from the flake food, they aren't going to bother with the algae.The Neon Blue Stiphodon goby I got from you doesn't seem to be eating much at all, I put in spirulina disks but he ignores them. Hasn't blued up yet either. He cruises around the tank with the other fish during feeding time, (flake food). I see him take nips at the morrimo moss ball every once in a while but he doesn't eat the algae on the glass or on the plants? He's not emaciated so I don't know quite what he is eating? I think I got him from you three weeks ago.
Stiphodons Goby is really scavengers instead pure algae cleaner like Oto. If you want them to eat alage on the glass, and plant, you will need to limit food source for them. It could be you over feed the tank and drop too much flake food at once.oxygen rich water, I've got that...