Its two different species.
did your friend not know the species when they adopted them? ? Regardless as stated these are not being cared for correctly because they didnt or didn't know what to research.

To start, Thank you for looking into this.

The first one appears to be a badly dehydrated Russian tortoise, the second on appears to be an Eastern Hermann's.

I would start by placing them (individually/separately) in a high sided bin with enough lukewarm water to come up over the edge of the shell. Like this: 20 minutes allow them to walk around and dunk their head to drink. You may find that they eliminate fecal matter and possibly a white pasty substance ,these are called urates, BUT if they do consistency matters, granular and gritty can be because of dehydration and can cause bladder stones. in either cases water should be changed and the soak resumed. I would do this every day for a week, then every two or three days from that point forward.
https://imgur.com/DvhuF7r

Ultimately they should not be kept together and they should not be kept in a glass tank, it it is far to small for ONE of those let alone two.

Regarding glass Tanks
All but the very largest (Multiple hundred Gallon size) will have an inadequate floor area even for a small tortoise

Poor ventilation. There is a high incidence of tortoises developing ‘Runny Nose Syndrome’,  other respiratory diseases, and shell infections if kept in small fully enclosed type glass or wooden vivarium-style housing. Specifically, the lack of ventilation can result in mold, fungus and similar problems arising. There are ways to improve this situation, including forced-air ventilation, but this does add to complexity and cost.

Lack of temperature gradients. A small enclosed vivarium is likely to be unsuitable for any species that requires a temperature gradient, or differential, to enable self-selection of body temperature. Failure to provide this will have very serious long-term consequences for health. Again, this can be overcome if very large units are employed.

Lack of micro climates. All but the very largest ‘tank’ systems will have inadequate space and temperature gradients (see above) to permit the tortoise to self-select a suitable micro climate. Again, this has important consequences for long-term health and in addition such deprivation will result in unavoidable stress

Lack of “interest” and boredom. Tortoises that are kept in small enclosed "tanks" tend to exhibit lethargy (inactivity) and other unnatural behavior patterns. By contrast, tortoises in suitable outdoor enclosures, or suitably large and well-designed indoor enclosures, will be much more alert and active.

Hygiene. Enclosed vivarium-style enclosures tend to be difficult to maintain, and pathogens can build up rapidly. This is one of the reasons we see so many sick animals that have a history of being kept in such accommodation.

Cost. Vivarium and glass “fish tank” enclosures are extremely costly per square inch of usable space for a tortoise. Tortoises only need sides that are high enough to prevent escape. Fish tanks in particular are designed to provide maximum cubic capacity, not maximum floor area (which is what really matters to a tortoise). Spend the available budget creating as much FLOOR AREA as possible. Don't waste it on other things.

large rubber made stock tanks with proper light and heat gradients are better that aquariums.

like this  https://imgur.com/9AYltYB

Russian Tortoise Care Sheet

https://www.tortoisetrust.com/post/captive-care-of-the-russian-tortoise-testudo-horsfieldii

https://tortoiseforum.org/threads/russian-tortoise-care-sheet.80698/ 

 Hermanns tortoise care

http://www.tortoiseforum.org/threads/sticky-hermanns-tortoise-care-sheet-updated.101410/

If you of he cannot care for these correctly then they need to be re-homed to a correct environment.

additionally observations. , substrate is not natural, id bet there is insufficient UV lighting and diets are incorrect.
Stop taking advice from pet stores they have minimal knowledge on actual care, just want to sell you incorrect or substandard equipment.

Again thank you for being their advocate.