This thread is about Sueshee's frogs, not a flame war about tattooing animals. There will be no further posts unrelated to OPs subject in here.
In regards to OPs last question, yes, if you keep pets in a system; all the pets need to share same environmental needs and be able to live together. Plecos are not good companions to any animal that can try an eat them due to their spines. They also grow very large and produce huge amounts of biomass waste. A glass cleaner is far more effective in a small tank.
AFC's are not good companions to fish, specially to warmer water tropicals. IRT your non-eating/floating on top frog, that is not normal. Please answer the below questions to try and figure out what is wrong; thank you.
“Trouble in the Frog Enclosure”
The following information will be very helpful if provided when requesting assistance with either your frog or enclosure. To help with your questions, please utilize the below list and post the information in the proper forum area to get advice from FF members that keep the same frog. This will allow for little confusion and a faster more informed response.
1. Tank Size and volume of water in it (full, 1/2 filled, etc.)?
2. Number of inhabitants including all frogs and any fish?
3. Water source and any conditioner treatments?
4. Water Temperature and how is it heated (if so)?
5. Water chemistry levels: pH; Ammonia (NH3); Nitrites (NO2); Nitrates (NO3)? Note that if you do not have test kits, most aquariums/pet shops will do complimentary tests if you take a clean water sample.
6. Describe any filter system including model and media?[/COLOR]
7. Substrate type?
8. Tank set-up (plants (live or artificial), driftwood, hide outs and other decor? - How were things prepared prior to being put into the tank?
9. Main frog staple food and any treats? How often you feed?
10. CA, vitamins, and any other additives used (how often)?
11. Lighting set-up and hours it's used?
12. When is the last time frog ate?
13. Have you found poop lately?
14. A picture would be helpful including frog and tank (any including cell phone pics are fine).
15. Describe frog's symptoms and/or recent physical changes; to include it's ventral/belly area.
16. How old is the frog?
17. How long have you owned him/her?
18. Is the frog wild caught or captive bred?
19. Any medications in the water (treatment doses and for how long)?
20. Any salt in water (how much)?
21. Is the tank kept in a high or low traffic area?
22. Describe tank maintenance to include water changes, cleaning, media changes, etc.).
By Lynn(flybyferns), GrifTheGreat, and aquatic questions added by Carlos(Mentat)