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Thank you, I wondered straight after I wrote it if it was. Unfortunately I'm not a person who has learned it off by heart. I will get it out and read along with it. Thank you

That is the Pancha Tatva mantra "Bhaja Shri Krishna Chaitanya prabhu Nityananda Shri Advaita Gadadhar Shrivas adi Gaur Bhakta vrinda"

oṁ pūrṇam adaḥ pūrṇam idaṁ pūrṇāt pūrṇam udacyate pūrṇasya pūrṇam ādāya pūrṇam evāvaśiṣyate [Isopanishad, Invocation] [The Personality of Godhead is perfect and complete, and because He is completely perfect, all emanations from Him, such as this phenomenal world, are perfectly equipped as complete wholes. Whatever is produced of the Complete Whole is also complete in itself. Because He is the Complete Whole, even though so many complete units emanate from Him, He remains the complete balance.] īśāvāsyam idam sarvaṁ yat kiñca jagatyāṁ jagat tena tyaktena bhuñjīthā mā gṛdhaḥ kasya svid dhanam [Īśo mantra 1] [Everything animate or inanimate that is within the universe is controlled and owned by the Lord. One should therefore accept only those things necessary for himself, which are set aside as his quota, and one should not accept other things, knowing well to whom they belong.] kurvann eveha karmāṇi jijīviṣec chataṁ samāḥ evaṁ tvayi nānyatheto 'sti na karma lipyate nare [Īśo mantra 2] [One may aspire to live for hundreds of years if he continuously goes on working in that way, for that sort of work will not bind him to the law of karma. There is no alternative to this way for man.] asuryā nāma te lokā andhena tamasāvṛtāḥ tāṁs te pretyābhigacchanti ye ke cātma-hano janāḥ [Īśo mantra 3] ["The killer of the soul, whoever he may be, must enter into the planets known as the worlds of the faithless, full of darkness and ignorance."] anejad ekaṁ manaso javīyo nainad devā āpnuvan pūrvam arṣat tad dhāvato 'nyān atyeti tiṣṭhat tasminn apo mātariśvā dadhāti [Īśo mantra 4] ["Although fixed in His abode, the Personality of Godhead is swifter than the mind and can overcome all others running. The powerful demigods cannot approach Him. Although in one place, He controls those who supply the air and rain. He surpasses all in excellence."] tad ejati tan naijati tad dūre tad v antike tad antar asya sarvasya tad u sarvasyāsya bāhyataḥ [Īśo mantra 5] ["The Supreme Lord walks and does not walk. He is far away, but He is very near as well. He is within everything, and yet He is outside of everything."] yas tu sarvāṇi bhūtāny ātmany evānupaśyati sarva-bhūteṣu cātmānaṁ tato na vijugupsate [Īśo mantra 6] ["He who systematically sees everything in relation to the Supreme Lord, who sees all living entities as His parts and parcels, and who sees the Supreme Lord within everything never hates anything or any being."] yasmin sarvāṇi bhūtāny ātmaivābhūd vijānataḥ tatra ko mohaḥ kaḥ śoka ekatvam anupaśyataḥ [Īśo mantra 7] ["One who always sees all living entities as spiritual sparks, in quality one with the Lord, becomes a true knower of things. What, then, can be illusion or anxiety for him?"] sa paryagāc chukram akāyam avraṇam asnāviram śuddham apāpa-viddham kavir manīṣī paribhūḥ svayambhūr yāthātathyato 'rthān vyadadhāc chāśvatībhyaḥ samābhyaḥ [Īśo mantra 8] ["Such a person must factually know the greatest of all, the Personality of Godhead, who is unembodied, omniscient, beyond reproach, without veins, pure and uncontaminated, the self-sufficient philosopher who has been fulfilling everyone's desire since time immemorial."] andhaṁ tamaḥ praviśanti ye 'vidyām upāsate tato bhūya iva te tamo ya u vidyāyām ratāḥ [Īśo mantra 9] ["Those who engage in the culture of nescient activities shall enter into the darkest region of ignorance. Worse still are those engaged in the culture of so-called knowledge."] anyad evāhur vidyayā- nyad āhur avidyayā iti śuśruma dhīrāṇāṁ ye nas tad vicacakṣire [Īśo mantra 10] ["The wise have explained that one result is derived from the culture of knowledge and that a different result is obtained from the culture of nescience."] anyad evāhuḥ sambhavād anyad āhur asambhavāt iti śuśruma dhīrāṇāṁ ye nas tad vicacakṣire [Īśo mantra 10] ["The wise have explained that one result is derived from the culture of knowledge and that a different result is obtained from the culture of nescience."] vidyāṁ cāvidyāṁ c yas tad vedobhayaṁ saha avidyayā mṛtyuṁ tīrtvā vidyayāmṛtam aśnute [Īśo mantra 11] ["Only one who can learn the process of nescience and that of transcendental knowledge side by side can transcend the influence of repeated birth and death and enjoy the full blessings of immortality."] andhaṁ tamaḥ praviśanti ye 'sambhūtim upāsate tato bhūya iva te tamo ya u sambhūtyām ratāḥ [Īśo mantra 12] ["Those who are engaged in the worship of demigods enter into the darkest region of ignorance, and still more so do the worshipers of the impersonal Absolute."] anyad evāhuḥ sambhavād anyad āhur asambhavāt iti śuśruma dhīrāṇāṁ ye nas tad vicacakṣire [Īśo mantra 13] [It is said that one result is obtained by worshiping the supreme cause of all causes and that another result is obtained by worshiping what is not supreme. All this is heard from the undisturbed authorities, who clearly explained it.] sambhūtiṁ ca vināśaṁ ca yas tad vedobhayaṁ saha vināśena mṛtyuṁ tīrtvā sambhūtyāmṛtam aśnute [Īśo mantra 14] [One should know perfectly the Personality of Godhead Śrī Kṛṣṇa and His transcendental name, form, qualities and pastimes, as well as the temporary material creation with its temporary demigods, men and animals. When one knows these, he surpasses death and the ephemeral cosmic manifestation with it, and in the eternal kingdom of God he enjoys his eternal life of bliss and knowledge.] hiraṇmayena pātreṇa satyasyāpihitaṁ mukham tat tvaṁ pūṣann apāvṛṇu satya-dharmāya dṛṣṭaye [Īśo mantra 15] [O my Lord, sustainer of all that lives, Your real face is covered by Your dazzling effulgence. Kindly remove that covering and exhibit Yourself to Your pure devotee.]

You can just follow Prabhupada's teachings, nothing to do with groups. You just need the right association.