Reddit mentions of Grow More 6048 Seaweed Extract 11%, 1-Quart

The top one seems severely underpotted. I've saved a phal in a similar situation to your second one except mine had only two leaves with one split down the middle length-wise. I saved it from my mother who over potted it and watered it like normal house-plants. I do't see any fungal infection but cutting away mushy roots is good. I would repot in a 4"+ pot with slits and additional holes. Medium-sized bark with some sphagnum mixed in. It seems you kept it in the tiny pot of tightly-packed moss for too long.

I also suggest using some kelp extract. I use it for all my rescues and repots - it majorly promotes root growth noticeably.

We need to also know more about where you keep your orchid, routine, and your location. Phal care in NYC (me) will differ from care in a dry, hot area like CA. You should be watering not by a schedule but by need - if you notice the roots are silvery and dry, that is when you should be watering. Twice a week seems like a lot - especially if the media is still wet, that definitely promotes conditions in which rot and infection could occur. The tight moss means very little airflow which all leads to root death. I water anywhere between 5 - 10 days based on need.

You can water by soaking as you are doing or by running water through the root area of the plant for a few mins and letting it fully drain. Remember that orchids are epiphytes and grow naturally on the sides of trees and rock in open air. The reason we use bark is because 90% of us don't like in ultra high humidity areas like Hawaii or the Philippines or Florida where these plants are native to. The bark/sphagnum/whatever media retains moisture but also provides enough airflow to somewhat simulate those ideal conditions.

Here is mine last August and here it is last month - it has even more roots now and growing a new leaf but I dont anticipate rebloom for another year or so.

Here's a shopping list for my current set-up. It's an extra small closet grow, but that's what i have to work with. You don't have to get exactly everything on this list, but you can use this for reference for your own grow!
Ill be running 1 plant at a time for now, with this set up.

Clip On Circulation Fan 6" - https://www.amazon.com/dp/B000U9V47E/ref=cm_sw_r_cp_apa_0mcDzb5826MEE

Ventech 440 CFM Exhaust Fan + Carbon Filter

5 Gallon Fabric Pot - https://www.amazon.com/dp/B002JUOWB2/ref=cm_sw_r_cp_apap_heETkTRSPOD2a

Programmable Digital Timer Switch - https://www.amazon.com/dp/B00P7RUGVO/ref=cm_sw_r_cp_apap_TTN7XnzIpVnyA

pH Calibration Solution - https://www.amazon.com/dp/B00P1MQWK4/ref=cm_sw_r_cp_apap_ahEtLDQTKcR5g

Digital PH Meter - https://www.amazon.com/dp/B01M8JU4TY/ref=cm_sw_r_cp_apap_NarNtEHiZIMNP

130w Cheap-o LED (TEMPORARY) -
https://www.amazon.com/dp/B01MPY7YC2/ref=cm_sw_r_cp_apap_bffmoa2zDlCSm

2x2x4 Grow Tent - https://www.amazon.com/dp/B01GCHXUVU/ref=cm_sw_r_cp_apap_qa9gCG2RwnFzZ

Seaweed Extract 11% - https://www.amazon.com/dp/B000NCWOEU/ref=cm_sw_r_cp_apa_dIcDzb4SDP9RY

Thermometer/Humidity Meter - https://www.amazon.com/dp/B06XTPTG1J/ref=cm_sw_r_cp_apap_dtVvdguE18m3E

I water him every. single. morning. and then spray a light mist of Miracle Grow Orchid Spray on the foliage once every week to two weeks. (Not Ideal, granted, but it's what was available at the store at the time.) I also recently purchased a bottle of kelp fertilizer, which I've used twice at 1/2 strength, which I think has attributed to the root growth. The orchid really started taking off when I nestled it in the live moss -- I've read that Den. laevefolium grow damp, nestled in crevices in deep fern/braken/moss, and the mount has a crevice in the wood which I put him in. I've also noticed a new growth peeping out from the tip of a pseudobulb. I'm unsure if this is a new leaf, or a bud(!!). We'll just have to wait and see.

This is my first orchid (and of course I've purchased a few more since then ((because I've found that once you have one orchid you end up having ten orchids seemingly overnight))), and overall I'm very pleased with this little guy's progress. I definitely won't detach the fishing line for a while.

I'm a bit surprised at the speed of growth, since I've read that Den. laevifolium tends to be a slow grower?? You certainly won't find me complaining!

Original post here, to compare growth