Photos, please. Sounds like you may have some water retention issues, as those trees are not designed to stay in the grower pots and soil for too long (designed to be planted in the ground). So, I would recommend re-potting your trees with a good, well-draining potting mix. If you search for "511" or "Gritty Mix" on this forum, you will get the formulas for some great, home made potting mixes. You should be then watering regularly. Testing the soil an inch or two down will only tell you if the soil is dry at the top. Not what's going on at the bottom of a pot. If water is being retained at the bottom, it will eventually rot the roots, and you'll kill your trees. Once you re-pot, you should be fertilizing regularly. Most container growers on this forum prefer to use Dyna Gro's Foliage Pro with every watering, as well as a high quality slow release product such as Osmocote Plus. A liquid fertilizer will help to reduce the build up of salts, which can burn your tree's roots. Flushing your citrus out occasionally is a good idea, but only if your potting medium drains well enough. Your fertilizer should be as close to a 5-1-3 NPK ratio as possible, along with all the micronutrients.

Post photos so we can help you further.

Patty S.

Here is a pic. It has since lost more leaves. Is it possible the soil was draining too well? I really don't know what's wrong with it. I am hoping it isn't a lost cause and I will see new growth on it. The base of some of the leaves have stayed green and healthy with the tips crunchy.

Here's a better pic. It is from my cell phone sorry about the rotation

It's recovering, and it was badly, badly dried out. It may be root bound (grapefruit and grapefruit hybrids can be pretty precocious growers), so I would pot up into a pot twice the size. Put in the shade, water appropriately. When you start to see new leaf flush, start fertilizing. Once the tree is clearly recovering with lots of new leaves, start to put into the sun slowly, until it is in full sun. If you nurse it carefully back to life, it will survive.

Patty S.

Thank you so much Patty. I put it in shade yesterday and it seems much happier today. The small parts of the leaves that are left are green and alive looking again. I have hope it will be back to its beautiful self eventually. I will take your advice and buy a bigger pot and make a batch of soil tomorrow to repot this weekend. Glad I didn't give up on it. Pretty new to this citrus tree thing.

Follow up! I haven't repot the tree yet, but I have pulled it into the shade and water it more. Today I noticed the leaves are growing back! So happy I didn't take it back now.