Red tailed shark and cory

[grode15]

I have a small red tail shark in my tank that is about 1.5-2 inches and it looks like he's getting a small lump on his stomach and at first I thought he was just getting fatter but than I saw my albino Cory also had a lump on his stomach

I couldent really get a good picture of the two of them but there it is.I feed them 1 time a day 3 hikari sinking wafers,1/4 a price of a algae wafer because there pretty big and the pleco is small only about 2.5 inches now and loves stealing the cities wafers,tropical granules,and tropical flakes.by the way I just did a water change yesterday and vacummed the gravel and my pH was 6.8,ammonia 0,nitrate about 40,nitrite 0 .please help I really don't want my fish to die so if anyone knows what it is and how to fix it please tell me.thanks

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[Delapool]

Can't see much unfortunately. How are they doing? Is the lump inside the fish or on the outside? Any other problems - are they still eating/swimming the same?

 

[grode15]

Yeah they seem fine and the red tail sharks tail is getting really red. Maybe the shark is getting fatter and my Cory could be pregnant?

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[Delapool]

That is good news. Maybe she is?