Weekend feeders for snails - Safe in this tank?

CBTF

;(
Jan 2, 2006
253
0
0
Toronto, Canada
My tank has only recently been set up, so it's newly established. It currently houses a betta, 2 mollies a shrimp and a frog, along with 2 apple snails.

One of the apple snail's shells is becoming quite weak looking, so I read that adding a weekend feeder can help. Here's where the problem is- it alters your PH. My PH isn't very stable right now and everything's a little wonky.

Also, my male molly has something wrong with him thay nobody has been able to identify. I think its internal- i've heard 2 explanations, either stress or water quality (both of which dont seem to be the problem imo..) but anyhow, think this will kill him/really screw up my tank, wiping everyone out or stressing them a lot?
 
ok for snails bird cuttlebone is better, plecos love them
 
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