SOS - red spots on hara jerdoni (anchor cat) belly

I love my new asian stone catfish/dwarf anchor cats (Hara jerdoni), but I have been worrying about feeding them too much (or too little?) lately. When I first got them, I noticed that their bellies were a dusty pink color. They were fed brine shrimp eggs for a few days until my bloodworms arrived, and now they've been getting those every 1-2 days. They scarf them down.
However, after the lights went out tonight, I noticed that their bellies are much redder than before. Almost bloody?
Is this because the cats are eating all the bloodworms, or are they possibly rubbing themselves raw on the tank? They glass surf a bit at night when they are begging for food, but spend most of the time sleeping/lying in one spot. They like to rest on my dwarf lily leaves, on the leaf-litter, and the driftwood. One occasionally sleeps on the rocks, which are the only hard/harsh things in the tank. Substrate is sand layered over aquarium soil, so no sharp edges.
Should I be worried?


Sorry for awful pics -these buggers are fast,

 

Bumping this because I am still worried about them

 

I would think that it would be because of the gravil or something but I have Cory’s and they are on gravil
I can’t really help check your parameters and makes sure their behavior is normal

 

I figured out that the pH was way too high in the tank been trying to lower it, and have been using more almond leaves + drinking water instead of tap, and the spots have gone away!

 

Good
As a new fish keeper I didn’t even know pH mattered

 

Good
As a new fish keeper I didn’t even know pH mattered

For some species it is very important. I know Hara jerdoni are pretty sensitive, and since the nitrites/ammonia/nitrates were fine, I assumed that it had to be pH. The water around here is just so hard...

 

Funny story on my very first tank we were planning on doing a South American tank but when we went to pick out the substrate I didn’t know about different substrate and got cichlid gravil (all my fish died and I had to restart the tank).

 

Funny story on my very first tank we were planning on doing a South American tank but when we went to pick out the substrate I didn’t know about different substrate and got cichlid gravil (all my fish died and I had to restart the tank).

Oh no! I'm sorry ):

 

Yeah something all new fish keepers need to know is be patient and when you think you have done enough research do some more
Don’t be to excited like I was and and pick up water you see